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Neutron observations from the energetic particle detector on China's Space Station 认领 引用 被引量：1
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作者 GuoHong Shen DongHui Hou +5 位作者 Yuan Chang XianGuo Zhang HuanXin Zhang Bin Yuan BinQuan Zhang Ying Sun 《Earth and Planetary Physics》 EI CSCD 2025年第2期460-466,共7页
The energetic particle detector on China's space station can determine the energy, flux, and direction of medium-and highenergy protons, electrons, heavy ions, and neutrons within the path of the station's orb... The energetic particle detector on China's space station can determine the energy, flux, and direction of medium-and highenergy protons, electrons, heavy ions, and neutrons within the path of the station's orbit. It also assesses the linear energy transfer(LET)spectra and radiation dose rates generated by these particles. Neutron detection is a significant component of this work, utilizing a new type of Cs2LiYCl6: Ce scintillator material along with plastic scintillators as sensors. In-orbit testing has demonstrated the efficient identification of space neutrons and gamma rays(n/γ). This data plays a crucial role in supporting manned space engineering, scientific research, and other related fields. 展开更多
关键词 China's space station energy particle detector neutron detection heavy ion detection radiation effect detection
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Propagation of large-scale solar wind events in the outer heliosphere from a numerical MHD simulation 认领 引用 被引量：3
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作者 XiaoCheng Guo YuCheng Zhou +1 位作者 Chi Wang Ying D.Liu 《Earth and Planetary Physics》 EI CAS CSCD 2021年第3期223-231,共9页
Voyager 1 occasionally detected sudden jumps of the local interstellar magnetic field strength since its heliopause crossing in August 2012.These events were believed to be associated with outward propagating solar wi... Voyager 1 occasionally detected sudden jumps of the local interstellar magnetic field strength since its heliopause crossing in August 2012.These events were believed to be associated with outward propagating solar wind shocks originating in the inner heliosphere.Here we investigate the correlation between interstellar shocks and large-scale solar wind events by means of numerical MHD simulation.The solar wind is simplified as a symmetric flow near the equatorial plane,and the interstellar neutrals are treated as a constant flow with a fixed density distribution along the upwind direction of the local interstellar medium.The charge exchanges between the solar wind plasma and the interstellar neutrals are taken into account.At a heliocentric distance of 1 AU,the solar wind data from OMNI,STEREO A and B during the period between 2010 and 2017 are used as the inner boundary conditions to drive the simulation.The simulation results showed that the solar wind gradually merges into large-scale structures as the radial distance increases,consistent with observations by New Horizons.After propagating into the inner heliosheath,the shocks are fully developed and the corresponding pressure pulses roughly agree with the observations by Voyager 2 in the inner heliosheath.The arrival of the shocks beyond the heliopause is estimated and found to be consistent with the observed signatures of interstellar shocks by Voyager 1.The possible origins of interstellar shocks in the inner heliosheath are discussed based on the simulation. 展开更多
关键词 MHD outer heliosphere solar wind interstellar medium shocks Voyager
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The Lobster Eye Imager for Astronomy Onboard the SATech-01 Satellite 认领 引用 被引量：3
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作者 Z.X.Ling X.J.Sun +123 位作者 C.Zhang S.L.Sun G.Jin S.N.Zhang X.F.Zhang J.B.Chang F.S.Chen Y.F.Chen Z.W.Cheng W.Fu Y.X.Han H.Li J.F.Li Y.Li Z.D.Li P.R.Liu Y.H.Lv X.H.Ma Y.J.Tang C.B.Wang R.J.Xie Y.L.Xue A.L.Yan Q.Zhang C.Y.Bao H.B.Cai H.Q.Cheng C.Z.Cui Y.F.Dai D.W.Fan H.B.Hu J.W.Hu M.H.Huang Z.Q.Jia C.C.Jin D.Y.Li J.Q.Li H.Y.Liu M.J.Liu Y.Liu H.W.Pan Y.L.Qiu M.Sugizaki H.Sun W.X.Wang Y.L.Wang Q.Y.Wu X.P.Xu Y.F.Xu H.N.Yang X.Yang B.Zhang M.Zhang W.D.Zhang Z.Zhang D.H.Zhao X.Q.Cong B.W.Jiang L.H.Li X.B.Qiu J.N.Sun D.T.Su J.Wang C.Wu Z.Xu X.M.Yang S.K.Zhang Z.Zhang N.Zhang Y.F.Zhu H.Y.Ban X.Z.Bi Z.M.Cai W.Chen X.Chen Y.H.Chen Y.Cui X.L.Duan Z.G Feng Y.Gao J.W.He T.He J.J.Huang F.Li J.S.Li T.J.Li T.T.Li H.Q.Liu L.Liu R.Liu S.Liu N.Meng Q.Shi A.T.Sun Y.M.Wang Y.B.Wang H.C.Wu D.X Xu Y.Q Yang Y.Yang X.S.Yu K.X.Zhang Y.L.Zhang Y.H.Zhang Y.T.Zhang H.Zhou X.C.Zhu J.S.Cheng L.Qin L.Wang Q.L.Wang M.Bai R.L.Gao Z.Ji Y.R.Liu F.L.Ma Y.J.Shi J.Su Y.Y.Tan J.Z.Tong H.T.Xu C.B.Xue G.F.Xue W.Yuan 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2023年第9期66-78,共13页
The Lobster Eye Imager for Astronomy(LEIA),a pathfinder of the Wide-field X-ray Telescope of the Einstein Probe mission,was successfully launched onboard the SATech-01 satellite of the Chinese Academy of Sciences on20... The Lobster Eye Imager for Astronomy(LEIA),a pathfinder of the Wide-field X-ray Telescope of the Einstein Probe mission,was successfully launched onboard the SATech-01 satellite of the Chinese Academy of Sciences on2022 July 27.In this paper,we introduce the design and on-ground test results of the LEIA instrument.Using stateof-the-art Micro-Pore Optics(MPO),a wide field of view of 346 square degrees(18.6°×18.6°)of the X-ray imager is realized.An optical assembly composed of 36 MPO chips is used to focus incident X-ray photons,and four large-format complementary metal-oxide semiconductor(CMOS)sensors,each of size 6 cm×6 cm,are used as the focal plane detectors.The instrument has an angular resolution of 4’-8’(in terms of FWHM)for the central focal spot of the point-spread function,and an effective area of 2-3 cm2at 1 keV in essentially all the directions within the field of view.The detection passband is 0.5-4 keV in soft X-rays and the sensitivity is2-3×10-11erg s-1cm-2(about 1 milliCrab)with a 1000 s observation.The total weight of LEIA is 56 kg and the power is 85 W.The satellite,with a design lifetime of 2 yr,operates in a Sun-synchronous orbit of 500 km with an orbital period of 95 minutes.LEIA is paving the way for future missions by verifying in flight the technologies of both novel focusing imaging optics and CMOS sensors for X-ray observation,and by optimizing the working setups of the instrumental parameters.In addition,LEIA is able to carry out scientific observations to find new transients and to monitor known sources in the soft X-ray band,albeit with limited useful observing time available. 展开更多
关键词 instrumentation detectors-space vehicles instruments-telescopes-X-rays genera
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A Four-State HLL Riemann Solver for Numerical Simulation of Magneto-Hydrodynamics Based on the Least Squares Solution for the Middle Wave 认领 引用
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作者 Xinyue Xi Xiaocheng Guo Chi Wang 《Communications in Computational Physics》 SCIE CSCD 2025年第3期675-700,共26页
By applying the least squares solution for the middle wave analysis inside the Riemann fan,we construct a four-state Harten-Lax-van Leer(HLL)Riemann solver for numerical simulation of magneto-hydrodynamics(MHD).First,... By applying the least squares solution for the middle wave analysis inside the Riemann fan,we construct a four-state Harten-Lax-van Leer(HLL)Riemann solver for numerical simulation of magneto-hydrodynamics(MHD).First,we revisit the twostate HLL scheme and obtain the two outer intermediate states across the two outbounding fast waves through Rankine-Hugoniot(R-H)conditions;Second,the two inner intermediate states are calculated using a geometric interpretation of the R-H conditions across the middle contact wave.This newly constructed four-state HLL solver contains different wave structures from those of the HLLD Riemann solver;namely,the two Alfv´en waves are replaced as the two combination waves originated from the merging of Alfv´en and slow waves inside the Riemann fan.As we tested,this solver resolves the MHD discontinuities well,and has better capture ability than the HLLD solver for the slow waves,although it appears more diffusive than the latter in the situations where the slow waves are not solely generated.Overall,the new solver has the similar accuracy as the HLLD solver,thus it is suitable for the calculation of numerical fluxes for the Godunov-type numerical simulation ofMHDequations where the slow waves are expected to be resolved. 展开更多
关键词 Magnetohydrodynamics Riemann solver HLLD HLLC-Linde
Research of Lunar Water-Ice and Exploration for China’s Future Lunar Water-Ice Exploration 认领 引用 被引量：13
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作者 Yingzhuo Jia Zhanlan Zhang +5 位作者 Lang Qin Tao Ma Bohan Lv Zhongliang Fu Changbin Xue Yongliao Zou 《Space(Science & Technology)》 2023年第1期206-213,共8页
Since the 1990s,the existence of water-ice in the permanent shadow areas of the lunar polar regions and the problem of water in the early lunar period have become the hot spot of international lunar exploration.This p... Since the 1990s,the existence of water-ice in the permanent shadow areas of the lunar polar regions and the problem of water in the early lunar period have become the hot spot of international lunar exploration.This paper analyzes the research progress and existing problems of lunar water-ice detection in recent years.Based on the analysis of expected foreign lunar water-ice exploration missions,the major scientific problems of lunar water-ice are analyzed.From different exploration methods,this paper tentatively puts forward the scientific tasks,payload configuration,functional requirements,and possible scientific outputs of water-ice in China's future lunar exploration projects,which can provide reference for future lunar exploration missions. 展开更多
关键词 Ice exploration Exploration
Vacuum-sealed miniature modulated x-ray source and the influence factors of x-ray intensity 认领 引用
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作者 李保权 牟欢 《Chinese Optics Letters》 SCIE EI CAS CSCD 2016年第7期107-110,共4页
The vacuum-sealed miniature modulated x-ray source （VMMXS） with a hot cathode is fabricated via the single- step brazing process in a vacuum furnace. An experiment following the VMMXS is implemented to present its p... The vacuum-sealed miniature modulated x-ray source （VMMXS） with a hot cathode is fabricated via the single- step brazing process in a vacuum furnace. An experiment following the VMMXS is implemented to present its performances, including the influence of grid electrode potential on x-ray intensities. The modulation type of the grid electrode as a switch is proposed, and its feasibility is successfully demonstrated. It is noteworthy to discover a phenomenon for the first time, to the best of our knowledge, that the high repetition frequency grid pulse of the VMMXS has a significant effect on the x-ray intensity. The probable cause for this new finding is analyzed. 展开更多
关键词 Vacuum-sealed miniature modulated x-ray source and the influence factors of x-ray intensity
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A 2D Fourth-Order CESE Scheme for Solving the Ideal MHD Equations 认领 引用
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作者 Yufen Zhou Xueshang Feng +2 位作者 Fang Shen Liping Yang Man Zhang 《Communications in Computational Physics》 SCIE CSCD 2025年第7期348-374,共27页
We construct a two-dimensional fourth-order space-time conservation element and solution element(CESE)schemes for solving the ideal magnetohydrodynamics(MHD)equations.In the CESE scheme,the flow variables are calculat... We construct a two-dimensional fourth-order space-time conservation element and solution element(CESE)schemes for solving the ideal magnetohydrodynamics(MHD)equations.In the CESE scheme,the flow variables are calculated by using the same procedure as that of the original second-order CESE scheme.The scheme preserves most favorable attributes of the original second-order CESE method.Moreover,it is simple and easy to program.The numerical example for the smooth Alfven wave problem suggests that the scheme can achieve the fourth-order accuracy for smooth solutions.In order to verify the efficiency of the schemes,we simulate several 2D MHD problems.We find that the fourth-order scheme can capture shocks and details of complex flow structures very well,and control the magnetic divergence efficiently.Moreover,the scheme is essentially CFL number insensitive schemes.The last several complex test problems further verify the performance of proposed scheme. 展开更多
关键词 CESE method fourth-order accuracy MHD
Two-Stage Solar Flare Forecasting Based on Convolutional Neural Networks 认领 引用 被引量：2
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作者 Jun Chen Weifu Li +5 位作者 Shuxin Li Hong Chen Xuebin Zhao Jiangtao Peng Yanhong Chen Hao Deng 《Space(Science & Technology)》 2022年第1期36-45,共10页
Solar flares are solar storm events driven by the magnetic field in the solar activity area.Solar flare,often associated with solar proton event or CME,has a negative impact on ratio communication,aviation,and aerospa... Solar flares are solar storm events driven by the magnetic field in the solar activity area.Solar flare,often associated with solar proton event or CME,has a negative impact on ratio communication,aviation,and aerospace.Therefore,its forecasting has attracted much attention from the academic community.Due to the limitation of the unbalanced distribution of the observation data,most techniques failed to effectively learn complex magnetic field characteristics,leading to poor forecasting performance.Through the statistical analysis of solar flare magnetic map data observed by SDO/HMI from 2010 to 2019,we find that unsupervised clustering algorithms have high accuracy in identifying the sunspot group in which the positive samples account for the majority.Furthermore,for these identified sunspot groups,the ensemble model that integrates the capability of boosting and convolutional neural network(CNN)achieves high-precision prediction of whether the solar flares will occur in the next 48 hours.Based on the above findings,a two-stage solar flare early warning system is established in this paper.The F1 score of our method is 0.5639,which shows that it is superior to the traditional methods such as logistic regression and support vector machine(SVM). 展开更多
关键词 Solar forecasting storm
A Two-Dimensional Third-Order CESE Scheme for Ideal MHD Equations 认领 引用 被引量：2
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作者 Yufen Zhou Xueshang Feng 《Communications in Computational Physics》 SCIE 2023年第6期94-115,共22页
In this paper,we construct a two-dimensional third-order space-time conservation element and solution element(CESE)method and apply it to the magnetohydrodynamics(MHD)equations.This third-order CESE method preserves a... In this paper,we construct a two-dimensional third-order space-time conservation element and solution element(CESE)method and apply it to the magnetohydrodynamics(MHD)equations.This third-order CESE method preserves all the favorable attributes of the original second-order CESEmethod,such as:(i)flux conservation in space and time without using an approximated Riemann solver,(ii)genuine multi-dimensional algorithm without dimensional splitting,(iii)the use of the most compact mesh stencil,involving only the immediate neighboring cells surrounding the cell where the solution at a new time step is sought,and(iv)an explicit,unified space-time integration procedure without using a quadrature integration procedure.In order to verify the accuracy and efficiency of the scheme,several 2D MHD test problems are presented.The result of MHD smooth wave problem shows third-order convergence of the scheme.The results of the other MHD test problems show that the method can enhance the solution quality by comparing with the original second-order CESE scheme. 展开更多
关键词 CESE method third-order MHD equations
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