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Research on imaging detection technology for 10–100 keV medium-energy electrons 认领 引用
1
作者 JiaChen Sun YuGuang Ye +3 位作者 Hong Zou JiaLi Chen TianHao Li WeiHong Shi 《Earth and Planetary Physics》 EI CSCD 2026年第2期337-348,共12页
Electrons in the energy range of 10–100 keV are important energetic particle components in the magnetosphere,and they play a key role in many physical processes in the magnetosphere.However,many scientific questions ... Electrons in the energy range of 10–100 keV are important energetic particle components in the magnetosphere,and they play a key role in many physical processes in the magnetosphere.However,many scientific questions about these processes are still unanswered.High spatiotemporal and energy-resolution imaging detection of 10–100 keV electrons is of great significance for solving these scientific problems.The traditional space particle detection technology cannot effectively detect the medium-energy electrons in this energy range.In this project,we propose combining low-noise particle detection technology with pinhole imaging technology to achieve high-resolution imaging detection of 10–100 keV medium-energy electrons in the magnetosphere,and at the same time achieve miniaturization(≤3.2 kg and size of 150×150×170 mm)and low power consumption(≤5 W)of the instrument,which can be used for space physics research and space weather applications in the future. 展开更多
关键词 10-100 keV medium-energy electrons quasi-three-dimensional imaging detection imaging electron spectrometer continuous spectrum
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Space Waterspout on Mars:MAVEN Observations of Siphoning Ion Escape from Mars through an Open Flux Tube 认领 引用
2
作者 Pu Yang Xiao-Jun Xu +8 位作者 Heng-Yan Man Si-Qi Yi Xing Wang Lei Luo Wen-Jing Zhao Pei-Shan He Zi-Lu Zhou Hui Li Jun Cui 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第7期10-17,共8页
Using data from the Mars Atmosphere and Volatile EvolutioN(MAVEN)mission,we report ion escape via the siphon effect within an open magnetic flux tube on Mars.MAVEN observed oppositely directed movements of hot solar w... Using data from the Mars Atmosphere and Volatile EvolutioN(MAVEN)mission,we report ion escape via the siphon effect within an open magnetic flux tube on Mars.MAVEN observed oppositely directed movements of hot solar wind protons and ionospheric ions,along with cold protons inside the flux tube,which can be explained by the siphoning escape mechanism.Collisions between hot solar wind protons and heavy ions in the lower Martian ionosphere transfer energy from the protons to the heavy ions,enabling their escape along with cooled protons through open magnetic field lines.This energy transfer reduces proton pressure within the flux tube,allowing continuous entry of hot solar wind protons that leads to ongoing ion loss.The high occurrence of open magnetic field lines in the Martian ionosphere suggests that siphoning ion escape could significantly contribute to the global ion loss of Mars. 展开更多
关键词 planets and satellites:individual(Mars) planets and satellites:atmospheres (Sun:)solar wind
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A novel geomagnetic satellite constellation:Science and applications 认领 引用 被引量：48
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作者 Keke Zhang 《Earth and Planetary Physics》 CAS CSCD 2023年第1期4-21,共18页
The European Space Agency(ESA)’s Swarm constellation of a trio of geomagnetic survey satellites in nearly circular polar orbits at altitude about 500 km was launched on 22 November 2013 and has been mapping the Earth... The European Space Agency(ESA)’s Swarm constellation of a trio of geomagnetic survey satellites in nearly circular polar orbits at altitude about 500 km was launched on 22 November 2013 and has been mapping the Earth’s global magnetic field in unprecedented details,helping scientists better understand how the geomagnetic field is generated and maintained inside the Earth’s fluid core and how the Earth’s external magnetic environment is changing.This review discusses a new novel constellation of the geomagnetic survey satellites that consists of at least four satellites:two satellites are in lower-latitude and nearly circular orbits at altitude about 450 km;two further satellites are marked by nearly polar but strongly eccentric orbits with perigee about 200 km and apogee about 5000 km.The new geomagnetic satellites are equipped with highly stable optical benches,high-precision fluxgate magnetometers and scalar magnetometers which are capable of mapping the Earth’s three-dimensional magnetic field in unprecedented accuracies and details.The new constellation will help elucidate different contributions to the measured geomagnetic field:the core dynamo field,the lithospheric magnetic field,the magnetic fields produced by currents in the ionosphere and the magnetosphere as well as by the currents coupling the ionosphere and magnetosphere,and the magnetic fields induced from the electrically conducting mantle,lithosphere and oceans.In comparison to the Swarm mission,it will provide higher-accuracy,higher-resolution and higher-dimension measurements of the geomagnetic field required for shedding new insights into the core dynamo processes and the Earth’s space magnetic systems along with a wide range of important applications. 展开更多
关键词 core dynamo geomagnetic field mantle ocean ionosphere magnetosphere
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A parametric study on how lightning-generated whistler waves propagate up into the magnetosphere 认领 引用
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作者 ZhouKun Deng ZhaoGuo He +4 位作者 Qi Yan FuLiang Xiao QingHua Zhou XiangLing Ding XiangYu Chen 《Earth and Planetary Physics》 EI CSCD 2026年第4期583-591,共9页
Lightning-generated whistler(LGW)waves leaking into the magnetosphere can efficiently scatter electrons into the atmosphere and produce a diffuse aurora.Here,we investigate the propagation of LGW waves by utilizing a ... Lightning-generated whistler(LGW)waves leaking into the magnetosphere can efficiently scatter electrons into the atmosphere and produce a diffuse aurora.Here,we investigate the propagation of LGW waves by utilizing a numerical ray tracing model.The simulations indicate that the spatial distribution of an LGW wave exhibits two peaks:one in the ionosphere and the other within L~2–3 in the magnetosphere.The ionospheric peak is due to the waves trapped in the ionosphere as they are emitted at low latitudes(λ~35°).Moreover,the LGW waves propagating into the magnetosphere are finally confined to specific magnetic shells because the wave normal angle increases to the Gendrin angle near the reflection point,subsequently leading to field-aligned propagation.These findings refine current characterization of the propagation and distribution of LGW waves in the magnetosphere,contributing to quantifying the precipitation losses of electrons. 展开更多
关键词 lightning-generated whistler ray tracing model ionosphere magnetosphere
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The behavior of a lithospheric magnetization and magnetic field model 认领 引用 被引量：7
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作者 PengFei Liu Yi Jiang +1 位作者 Qing Yan Ann MHirt 《Earth and Planetary Physics》 CAS CSCD 2023年第1期66-73,共8页
The Earth’s“lithosphere”is its outer shell,made up of the Earth’s crust and outermost mantle.The part of the Earth’s magnetic field that originates in the lithosphere consists of a superposition of magnetic anoma... The Earth’s“lithosphere”is its outer shell,made up of the Earth’s crust and outermost mantle.The part of the Earth’s magnetic field that originates in the lithosphere consists of a superposition of magnetic anomalies with a broad spectrum of sizes and intensities,which arise from geological and tectonic features.The lithospheric magnetic field is known from surface observations,and on larger scales from above-surface measurements.The increase in recent decades of satellites dedicated to measuring the Earth’s magnetic field has improved significantly our models of the Earth’s magnetic environment.Based on these increasing observations,a number of comprehensive field models have been constructed,some of which focus solely on the lithosphere,such as the MF model series.We present a map of lithospheric magnetic anomalies at 400 km altitude,based on a vertically integrated magnetization model.This height was chosen because it is the expected orbital altitude of the Macao Science Satellite-1(MSS-1)mission.The model presented herein indicates that the amplitude of the lithospheric anomalies at 400 km altitude is between-14.8 n T and 18.2 n T.This information is useful because it provides a reference for the lithospheric source of the Earth’s magnetic field that contributes to the magnetic measurements made from satellite instruments.The low inclination orbit of the MSS-1 mission will provide information that is sensitive to lateral variation within the lithosphere;these variations arise from plate tectonic features with longitudinal extent.In conclusion,the new MSS-1mission will provide valuable information in detecting compositional variations in the lithosphere,and in delineating large-scale geological structures. 展开更多
关键词 vertically integrated magnetization lithospheric magnetic field field model MSS-1
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A finite volume method for global electromagnetic induction forward modeling on collocated unstructured grids 认领 引用 被引量：3
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作者 Liang Yin ZhengYong Ren +1 位作者 HongBo Yao Cong Yang 《Earth and Planetary Physics》 CAS CSCD 2023年第1期57-65,共9页
Global electromagnetic induction provides an efficient way to probe the electrical conductivity in the Earth’s deep interior.Owing to the increasing geomagnetic data especially from high-accuracy geomagnetic satellit... Global electromagnetic induction provides an efficient way to probe the electrical conductivity in the Earth’s deep interior.Owing to the increasing geomagnetic data especially from high-accuracy geomagnetic satellites,inverting the Earth’s three-dimensional conductivity distribution on a global scale becomes attainable.A key requirement in the global conductivity inversion is to have a forward solver with high-accuracy and efficiency.In this study,a finite volume method for global electromagnetic induction forward modeling is developed based on unstructured grids.Arbitrary polyhedral grids are supported in our algorithms to obtain high geometric adaptability.We employ a cell-centered collocated variable arrangement which allows convenient discretization for complex geometries and straightforward implementation of multigrid technique.To validate the method,we test our code with two synthetic models and compare our finite volume results with an analytical solution and a finite element numerical solution.Good agreements are observed between our solution and other results,indicating acceptable accuracy of the proposed method. 展开更多
关键词 global electromagnetic induction mantle electrical conductivity finite volume method unstructured grids
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Calibration of the Solar X-ray Detector on-board the Macao Science Satellite-1B for Soft X-ray Detection 认领 引用
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作者 Man-Hei NG Xiaoping ZHANG +13 位作者 Jianwu CHEN Yongqiang SHI Fuchang ZUO Wenxi PENG Weichun FU Liansheng LI Pengwei LUO Chi-Long TANG Guozheng ZHANG Zhiwu MEI Li WANG Cunhui LI Jiaming OU Yanyan Xu 《Science China Earth Sciences》 SCIE EI CAS CSCD 2025年第1期11-26,共16页
The Solar X-ray Detector(SXD)on-board the Macao Science Satellite-1B(MSS-1B)was successfully launched via the Chinese Long March-2C rocket on 21 May 2023,and commenced operations in early June of the same year.The MSS... The Solar X-ray Detector(SXD)on-board the Macao Science Satellite-1B(MSS-1B)was successfully launched via the Chinese Long March-2C rocket on 21 May 2023,and commenced operations in early June of the same year.The MSS-1B/Soft X-ray Detection Units(SXDUs)employ two silicon drift detectors(SDDs),providing a wide range of energy spectra spanning from 0.7 to 24 keV.Notably,the SXDUs deliver a high-resolution capability of 0.14 keV@5.9 keV and operate with a time cadence of 1 second.Here,we perform thorough calibrations of the MSS-1B/SXDUs,employing a combination of ground experiments and simulations.In addition,quantitative analysis comparing the flux measurements obtained by the MSS-1B/SXDUs to the data collected by the Geostationary Operational Environmental Satellite(GOES),provides compelling evidence of their consistency.Furthermore,the preliminary spectral analysis results showcase the robustness and expected performance of the MSS-1B/SXDUs,unlocking their potential for facilitating the study of dynamic evolution of solar flares.Moreover,the innovative MSS-1B/Solar X-ray Detector facilitates concurrent observations of solar soft and hard X-rays,thereby making valuable contributions to the advancements in solar research. 展开更多
关键词 Macao Science Satellite-1B(MSS-1B) Calibration Solar X-Ray Detector Spectrometer Soft X-rays Solar flares Solar abundances
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Spectral deconvolution analysis on Olivine-Orthopyroxene mixtures with simulated space weathering modifications 认领 引用
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作者 Hui-Jie Han Xiao-Ping Lu +4 位作者 Te Jiang Chih-Hao Hsia Ya-Zhou Yang Peng-Fei Zhang Hao Zhang 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2021年第5期255-273,共19页
Olivine and pyroxene are important mineral end-members for studying the surface material compositions of mafic bodies.The profiles of visible and near-infrared spectra of olivine-orthopyroxene mixtures systematically ... Olivine and pyroxene are important mineral end-members for studying the surface material compositions of mafic bodies.The profiles of visible and near-infrared spectra of olivine-orthopyroxene mixtures systematically vary with their composition ratios.In our experiments,we combine the RELAB spectral database with new spectral data obtained from some assembled olivine-orthopyroxene mixtures.We found that the commonly-used band area ratio(BAR,Cloutis et al.)does not work well on our newly obtained spectral data.To investigate this issue,an empirical procedure based on fitted results by a modified Gaussian model is proposed to analyze the spectral curves.Following the new empirical procedure,the endmember abundances can be estimated with a 15%accuracy with some prior mineral absorption features.In addition,the mixture samples configured in our experiments are also irradiated by pulsed lasers to simulate and investigate the space weathering effects.Spectral deconvolution results confirm that low-content olivine on celestial bodies is difficult to measure and estimate.Therefore,the olivine abundance of space weathered materials may be underestimated from remote sensing data.This study may be utilized to quantify the spectral relationship of olivine-orthopyroxene mixtures and further reveal their correlation between the spectra of ordinary chondrites and silicate asteroids. 展开更多
关键词 techniques:spectroscopic instrumentation:spectrographs methods:data analysis minor planets,asteroids:general
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Resonance and antiresonance characteristics in linearly delayed Maryland model 认领 引用
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作者 Hsinchen Yu Dong Bai +3 位作者 Peishan He Xiaoping Zhang Zhongzhou Ren Qiang Zheng 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第12期102-109,共8页
The Maryland model is a critical theoretical model in quantum chaos.This model describes the motion of a spin-1/2particle on a one-dimensional lattice under the periodical disturbance of the external delta-function-li... The Maryland model is a critical theoretical model in quantum chaos.This model describes the motion of a spin-1/2particle on a one-dimensional lattice under the periodical disturbance of the external delta-function-like magnetic field.In this work,we propose the linearly delayed quantum relativistic Maryland model(LDQRMM)as a novel generalization of the original Maryland model and systematically study its physical properties.We derive the resonance and antiresonance conditions for the angular momentum spread.The“characteristic sum”is introduced in this paper as a new measure to quantify the sensitivity between the angular momentum spread and the model parameters.In addition,different topological patterns emerge in the LDQRMM.It predicts some additions to the Anderson localization in the corresponding tight-binding systems.Our theoretical results could be verified experimentally by studying cold atoms in optical lattices disturbed by a linearly delayed magnetic field. 展开更多
关键词 quantum chaos dynamical localization resonance and topology
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Evolution of Subkilometer-scale Impact Craters on the Lunar Maria as Constrained from Mini-RF Data and Topographic Degradation Model 认领 引用
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作者 孙庆海 法文哲 +1 位作者 祝梦华 都骏 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2023年第12期19-33,共15页
Physical properties(e.g.,ejecta size and distribution)of impact craters are crucial and essential to understanding the ejecta excavation and deposition process,estimating rock breakdown rate,and revealing their evolut... Physical properties(e.g.,ejecta size and distribution)of impact craters are crucial and essential to understanding the ejecta excavation and deposition process,estimating rock breakdown rate,and revealing their evolution characteristics.However,whether these physical properties are scale-dependent and how they evolve in different radial regions needs further studies.In this study,we first investigated the physical properties and evolution of subkilometer(D≤800 m)craters on lunar maria based on the radar circular polarization ratio(CPR).In addition,we estimated the periods over which rocks and blocky ejecta are exposed and buried in the shallow subsurface layer(termed as exposure time)in different radial regions and assessed the retention time and degradation states for potential radar anomalous craters.We found that in the central region of craters,the largest median CPR occurs after an 80 Myr delay following crater formation.In the rim region,there is no obvious CPR peak in the first100 Ma,whereas in the upper wall region,an evident CPR peak occurs beyond 100 Ma and could last over one billion years.In addition,the probable exposure time of rocks and blocky ejecta is estimated to be~2.0 Gyr(central region),~2.7 Gyr(upper wall region),~2.1 Gyr(rim region),and~0.6 Gyr(continuous ejecta blanket region).We also propose that the retention time of radar anomalous craters depends on the crater size,whereas their degraded states are independent of crater size. 展开更多
关键词 Moon-planets and satellites surfaces-planets and satellites physical evolution
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Preservation characteristics of biosignatures in sulfates and their implications for the search for life on Mars 认领 引用
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作者 Yihao XIE Ting HUANG +1 位作者 Jiannan ZHAO David C.FERNANDEZ-REMOLAR 《Science China Earth Sciences》 SCIE EI CAS CSCD 2025年第9期2867-2890,共24页
Sulfate minerals are widely distributed across various geological settings on Earth and provide critical insights into a range of geochemical processes and environmental evolution.Both modern and ancient sulfates poss... Sulfate minerals are widely distributed across various geological settings on Earth and provide critical insights into a range of geochemical processes and environmental evolution.Both modern and ancient sulfates possess exceptional potential for preserving biosignatures.Recent studies utilizing remote sensing and in situ exploration techniques have identified extensive sulfate-bearing deposits on the Martian surface.Investigating the habitability and the potential for biosignature preservation in these regions is a key focus in the search for life on Mars.Therefore,this review synthesizes the types,distribution,and formation environments of terrestrial sulfate minerals and summarizes the occurrence and preservation characteristics of biosignatures within both modern and ancient terrestrial sulfates.In light of the current understanding of the occurrence of Martian sulfates,the study further explores the potential for biosignature preservation within Martian sulfate deposits.Finally,drawing on results from current in situ life-detection missions and the objectives of forthcoming Mars sample return missions,this paper provides scientific recommendations for biosignature detection strategies and landing site selection in future Mars exploration missions. 展开更多
关键词 Sulfate mineral Biosignature exploration Mars Sample return
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NWA 16813(CK6) Records Almost Highest Oxygen Fugacity in Meteorites 认领 引用
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作者 Lei Jin Tsz Wai Lo Ian Tong Fong 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2025年第7期79-87,共9页
Magnetite-ilmenite pairs in meteorites serve as reliable thermometers and oxygen fugacity (fO2) indicators for constraining both nebular conditions and thermal metamorphic histories.While CK and CV chondrites exhib... Magnetite-ilmenite pairs in meteorites serve as reliable thermometers and oxygen fugacity (fO2) indicators for constraining both nebular conditions and thermal metamorphic histories.While CK and CV chondrites exhibit nearly identical petrological characteristics and oxygen isotope compositions,our analysis of NWA 16813 reveals it records the highest fO2(log fO2=-20.51 (589.34°C)-log fO2=-14.21 (608.63°C))yet measured among these meteorites.This finding provides critical evidence that CK and CV chondrites experienced fundamentally different redox conditions during their formation.The fO2data from NWA16813,combined with its distinct petrological and mineralogical features,strongly suggest that CK and CV chondrites originated from chemically separate reservoirs in the protoplanetary disk despite their apparen similarities. 展开更多
关键词 meteorites,meteors,meteoroids Planetary Systems minor planets,asteroids:general
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Medium-energy electron spectrometers on Macao Science Satellite-1 认领 引用 被引量：8
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作者 YE YuGuang LIU Ying +12 位作者 ZOU Hong ZONG QiuGang CHEN JiaLi YU XiangQian SHI WeiHong OU JiaMing LIU JianBin YU LiJia ZHOU Jun HUANG He YUAN ShiGeng SU Wen SUO Le 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2024年第11期3324-3343,共20页
The Macao Science Satellite-1 is a two-satellite constellation specifically designed to study the geomagnetic field and particle radiation environment in low Earth orbit,particularly in the South Atlantic Anomaly regi... The Macao Science Satellite-1 is a two-satellite constellation specifically designed to study the geomagnetic field and particle radiation environment in low Earth orbit,particularly in the South Atlantic Anomaly region,with a low inclination orbit.Each of the two MSS-1 satellites carries a medium-energy electron spectrometer(MES).The MES sensor heads are based on pinhole imaging technology,which can simultaneously measure 50-600 keV electrons incident from nine directions with a field of view(FOV)of 180°×30°.The two MESs can realize the pitch angle coverage of medium energy electrons at most positions in the orbit.The MSS-1 A/B MESs can realize direct observation of precipitating electrons and electrons near their loss cones.It can help to study the electron generation mechanism in the inner radiation belt and quantify the precipitation of magnetospheric energetic electrons.Combined with the geomagnetic index,solar wind parameters,interplanetary magnetic field conditions,etc.,it can also help to build a dynamic evolution model of energetic electrons in the near-Earth space,to realize the early warning and prediction of space weather based on the observation data,which can provide safety for spacecraft and astronauts in the nearEarth space. 展开更多
关键词 Macao Science Satellite-1 medium-energy electron spectrometer inner radiation electrons Southern Atlantic Anomaly pitch angle distribution
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Theoretical study of the ionospheric dynamo region inside the South Atlantic Anomaly 认领 引用 被引量：4
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作者 SiQi Yi XiaoJun Xu +5 位作者 ZiLu Zhou Qing Chang Xing Wang Lei Luo PeiShan He Hui Li 《Earth and Planetary Physics》 CAS CSCD 2023年第1期84-92,共9页
The South Atlantic Anomaly(SAA)is a region where the geomagnetic field is significantly lower than that of the surrounding area.On the basis of the models of CHAOS-7.8,Mass Spectrometer Incoherent Scatter Model(NRLMSI... The South Atlantic Anomaly(SAA)is a region where the geomagnetic field is significantly lower than that of the surrounding area.On the basis of the models of CHAOS-7.8,Mass Spectrometer Incoherent Scatter Model(NRLMSISE-00),and International Reference Ionosphere 2016(IRI-2016),we theoretically investigated the lower and upper boundaries of the ionospheric dynamo region inside the SAA.In the ionospheric dynamo region,electrons are coupled with magnetic field lines,whereas ions are decoupled from magnetic field lines.Our results showed that the ionospheric dynamo region inside the SAA is higher and larger than that outside the SAA.We also studied the boundary variations of the dynamo region inside the SAA depending on the seasons and solar activities.We found that the dynamo region inside the SAA is the highest and largest in the summer of the southern hemisphere at solar maximum.The larger and higher altitude range of the ionospheric dynamo region in the SAA can contribute to the stronger ionospheric currents in this region. 展开更多
关键词 South Atlantic Anomaly ionospheric dynamo region ionosphere
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High-energy electron spectrometer on Macao Science Satellite-1 认领 引用 被引量：2
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作者 YE YuGuang LIU Ying +10 位作者 ZOU Hong ZONG QiuGang CHEN JiaLi YU XiangQian SHI WeiHong OU JiaMing LIU JianBin SUN HuaLiang YUAN ShiGeng SU Wen SUO Le 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2024年第12期3909-3924,共16页
Macao Science Satellite-1(MSS-1)is a two-star constellation mission sponsored jointly by the China National Space Administration(CNSA)and the Macao University of Science and Technology(MUST).The mission aims to explor... Macao Science Satellite-1(MSS-1)is a two-star constellation mission sponsored jointly by the China National Space Administration(CNSA)and the Macao University of Science and Technology(MUST).The mission aims to explore the geomagnetic field and space particle radiation environment in low-inclination low Earth orbit.The satellite A of MSS-1(MSS-1A)carries the third-generation high-energy electron spectrometer(HES),developed by Peking University,to detect high-energy electrons.The HES sensor head utilizes a conventionalΔE-E silicon detector telescope,enabling measurements of high-energy electrons within a 45°cone angle field of view,ranging from 0.3 to 3.0 MeV.As a new generation of high-energy electron detectors(HEDs),the HES operates by default in the in-orbit multi-channel mode,allowing 128 segmented linear distributed energy bin counting measurements with a time resolution of 1 s.High energy resolution observations of high-energy electrons in the inner radiation belt by the HES onboard MSS-1A can help investigate the following questions:Do MeVelectrons exist in the inner radiation belt?What is the production mechanism of relativistic electrons in the inner radiation belt? 展开更多
关键词 Macao Science Satellite-1 high-energy electron spectrometer inner radiation belt electrons Southern Atlantic Anomaly in-orbit multi-channel mode
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Measurement of Br(n,γ)cross sections up to stellar s-process temperatures at the CSNS Back‑n 认领 引用 被引量：3
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作者 Gao‑Le Yang Zhen‑Dong An +43 位作者 Wei Jiang Xian‑Kai Li Wei‑Wei Qiu Zheng‑Fa Liao Zi‑Yue Zhuang Xiao‑Ping Zhang Sheng‑Li Chen Chen‑Chen Guo Er‑Xi Xiao Xiao Fang Xin‑Xiang Li Xin‑Rong Hu Bing Jiang Jin‑Cheng Wang Jie Ren Wen Luo Zhi‑Chao Zhu Hao‑Yang Lan Zong‑Wei Cao Xu Ma Ying‑Du Liu Pu‑Sen Wang Yi Yang Ping Su Xian‑Gai Deng Wan‑Bing He Chun‑Wang Ma Yu‑Ting Wang Zhi‑Tao Dai Peng‑Qin He Ren‑Guang Tang Tao Zhou Jing Wang Han Yi Yue Zhang Yong‑Hao Chen Rui‑Rui Fan Ke‑Qing Gao Qiang Li Kang Sun Zhi‑Xin Tan Min‑Hao Gu Han‑Tao Jing Jing‑Yu Tang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第11期226-241,共16页
The neutron capture cross sections(n,γ)of bromine were obtained using the time-of-flight technique at the Back-n facility of the China Spallation Neutron Source.Promptγ-rays originating from neutron-induced capture ... The neutron capture cross sections(n,γ)of bromine were obtained using the time-of-flight technique at the Back-n facility of the China Spallation Neutron Source.Promptγ-rays originating from neutron-induced capture events were detected using four C6D6 detectors.The pulse-height weighting technique and double-bunch unfolding method based on Bayesian theory were used in the data analysis.Background deductions,normalization,and corrections were carefully considered to obtain reliable measurement results.The multilevel R-matrix Bayesian code SAMMY was used to extract the resonance parameters in the resolved resonance region(RRR).The average cross sections in the unresolved resonance region(URR)were obtained from 10 to 400 keV.The experimental results were compared with data from several evaluated libraries and previous experi-ments in the RRR and URR.The TALYS code was used to describe the average cross sections in the URR.The astrophysical Maxwell average cross sections(MACSs)of 79,81Br from kT=5 to 100 keV were calculated over a sufficiently wide range of neutron energies.At a thermal energy of kT=30 keV,the MACS value for 79Br 682±68 mb was in good agreement with the KADoNiS v1.0 recommended value.By contrast,the value of 293±29 mb for 81Br was substantially higher than that of the evaluated database and the KADoNiS v1.0 recommended value. 展开更多
关键词 Time-of-flight technique Neutron capture cross sections Maxwell average cross sections
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Latitudinal distribution and propagation of lightning-generated whistler:A statistical study by Van Allen Probes observation and ray-tracing simulation 认领 引用 被引量：1
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作者 Zhaoguo HE Jiang YU +5 位作者 Xiangling DING Zuzheng CHEN Nigang LIU Yuguang YE Jun CUI Qiugang ZONG 《Science China Earth Sciences》 SCIE EI CAS CSCD 2025年第4期1291-1297,共7页
Lightning-generated whistler(LGW)is an important electromagnetic wave in the magnetosphere,causing energetic electron losses.Here we analyze the LGW distribution and propagation using Van Allen Probes data and ray-tra... Lightning-generated whistler(LGW)is an important electromagnetic wave in the magnetosphere,causing energetic electron losses.Here we analyze the LGW distribution and propagation using Van Allen Probes data and ray-tracing simulation.The statistics show that LGW occurs more frequently at L<2.5 with higher amplitudes in the northern hemisphere.The Poynting flux demonstrates that LGW originates from both hemispheres within L~2.5,and propagates into the space as the wave power decays.The wave normal angle distributions indicate that LGW propagates quasi-parallel to the field line near its source and becomes oblique as the magnetic latitude decreases.Furthermore,we use the ray-tracing model to simulate the LGW propagation,and statistically analyze the propagation characteristics of LGW,which are consistent with the observational data.This paper presents the latitudinal distribution and propagation properties of LGW based on statistics for the first time,providing new insights into the LGW generation and evolution in the magnetosphere. 展开更多
关键词 Lightning-generated whistler Ray-tracing model Magnetosphere Wave distribution Wave propagation
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The siphonic energy transfer between hot solar wind and cold martian ionosphere through open magnetic flux rope 认领 引用 被引量：3
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作者 Xiaojun Xu Lou-Chuang Lee +12 位作者 Qi Xu Qing Chang Jing Wang Ming Wang Shaosui Xu Christian Mosti Charles J.Farrugia Xing Wang Yudong Ye Zilu Zhou Lei Luo Peishan He Shaoguan Cheng 《Fundamental Research》 CAS CSCD 2024年第4期882-889,共8页
A mechanism for energy transfer from the solar wind to the Martian ionosphere through open magnetic flux rope is proposed based on the observations by Mars Atmosphere and Volatile EvolutioN(MAVEN).The satellite was lo... A mechanism for energy transfer from the solar wind to the Martian ionosphere through open magnetic flux rope is proposed based on the observations by Mars Atmosphere and Volatile EvolutioN(MAVEN).The satellite was located in the dayside magnetosheath at an altitude of about 70o km above the northern hemisphere.Collisions between the hot solar wind protons and the cold heavy ionseutrals in the subsolar region can cool the protons and heat the heavy ions.As a result,the magnetosheath protons are siphoned into the ionosphere due to the thermal pressure gradient of protons and the heated heavy ions escape along the open magnetic field lines.Although direct collisions in the lower-altitude region were not detected,this physical process is demonstrated by MAVEN measurements of enhanced proton density,decreased proton temperature and oppositely directed motions of hot and cool protons within the flux rope,which are very different from the observational features of the flux transfer events near the Earth's magnetopause.This mechanism could universally exist in many contexts where a collisionless plasma region is connected to a collisional plasma region.By reconstructing the magnetic geometry and the cross-section of the flux rope using the Grad-Shafranov technique,the ion loss rates are quantitatively estimated to be on the order of 1023 s-l,which is much higher than previously estimated. 展开更多
关键词 Mars Flux rope Solarwind Ionosphere Ion loss
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