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Ultralow frequency wave characteristics extracted from particle data:Application of IGSO observations

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Science China(Technological Sciences) 2017年第3期60卷 419-424页

作者： LI Li ZHOU XuZhi ZONG QiuGang CHEN XingRan ZOU Hong REN Jie HAO YiXin ZHANG XianGuo Institute of space Physics and Applied Technology Peking University College of Astronautics Nanjing University of Aeronautics and Astronautics State Key laboratory of space weather National Space Science CenterChinese Academy of Sciences

3 Summary and discussion In the generalized drift resonance theory[17],a characteristic signature of the ULF wave-particle interactions is the increasingly-tilted stripes in the particle energy *** phase difference ac... 详细信息

关键词： ultralow frequency waves wave-particle interactions drift resonance ULF wave characteristics

Gyroresonance Between Electromagnetic Ion Cyclotron Waves and Particles in a Multi-ion Plasma

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Plasma Science and Technology 2009年第5期11卷 539-543页

作者：贺慧勇陈良旭田天贺艺华李亚捷聂六英 School of Physics and Electronic Sciences Changsha University of Science and Technology State Key laboratory of space weather School of Earth and space Sciences Peking University

The gyroresonant interaction between electromagnetic ion cyclotron （EMIC） waves and energetic particles was studied in a multi-ion （H^＋, He^＋, and O^＋） plasma. The minimum resonant energy Emin, resonant wave frequency w, and pitch angle diffusion coefficient Daa were calculated at the center location of the symmetrical ring current： r ≈3.5RE with RE the Earth＇s radius. Emin is found to decrease rapidly from 10 MeV to a few keV with the increase in ca in three bands： H^＋-band, He^＋-band and O^＋-band. Moreover, EMIC waves have substantial potential to scatter energetic （～100 keV） ions （mainly H^＋ and He^＋） into the loss cone and yield precipitation loss, suggesting that wave-particle interactions contribute to ring current decay.

关键词： wave-particle interaction ring current decay EMIC waves multi-ion plasma

Daytime lidar measurements of the sodium layer in China

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Science China Earth Sciences 2016年第8期59卷 1707-1708页

作者： LIU Xiao XU JiYao School of Mathematics and Information Science Henan Normal University State Key laboratory of space weather National Space Science Center Chinese Academy of Sciences

Metal layers are formed owing to the deposition of metal species, such as, Na, Fe, Ma, Si, Ca, and K, in the mesosphere and lower thermosphere region. The metal species come from the meteor ablations when meteors enter into the atmosphere （Plane, 1991）. Among these species, Na can be easily detected by sodium lidar since it has enough abundance and large backward scattering cross-section. On the other hand, the chemical lifetime of the sodium layer is longer than one day in the main sodium layer （85-100 km） and thus can be employed as a dynamical tracer for atmospheric perturbations （Xu et al., 2003）.

关键词： lidar backward lifetime enough abundance longer

Magnetohydrodynamics (MHD) numerical simulations on the interaction of the solar wind with the magnetosphere: A review

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Science China Earth Sciences 2013年第7期56卷 1141-1157页

作者： WANG Chi GUO XiaoCheng PENG Zhong TANG BinBin SUN TianRan LI WenYa HU YouQiu State Key laboratory of space weather Center for Space Science and Applied Research Chinese Academy of Sciences School of Earth and space Sciences University of Science and Technology of China

The magnetosphere is the outermost layer of the geospace, and the interaction of the solar wind with the magnetosphere is the key element of the space weather cause-and-effect chain process from the Sun to Earth, which is one of the most challenging scientific problems in the geospace weather study. The nonlinearity, multiple component, and time-dependent nature of the geospace make it very difficult to describe the physical process in geospace using traditional analytic analysis approach. Numerical simulations, a new research tool developed in recent decades, have a deep impact on the theory and application of the geospace. MHD simulations started at the end of the 1970s, and the initial study was limited to two-dimensional (2D) cases. Due to the intrinsic three-dimensional (3D) characteristics of the geospace, 3D MHD simulations emerged in the 1980s, in an attempt to model the large-scale structures and fundamental physical processes in the magnetosphere. They started to combine with the space exploration missions in the 1990s and make comparisons with observations. Physics-based space weather forecast models started to be developed in the 21st century. Currently only a few space-power countries such as USA and Japan have developed 3D magnetospheric MHD models. With the rapid advance of space science in China, we have developed a new global MHD model, namely PPMLR-MHD, which has high order spatial accuracy and low numerical dissipation. In this review, we will briefly introduce the global 3D MHD modeling, especially the PPMLR-MHD code, and summarize our recent work based on the PPMLR-MHD model, with an emphasis on the interaction of interplanetary shocks with the magnetosphere, large-scale current systems, reconnection voltage and transpolar potential drop, and Kelvin-Helmholtz (K-H) instability at the magnetopause.

关键词： solar wind magnetosphere MHD simulations

Nighttime anomaly of ionospheric electron density

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Science China Earth Sciences 2016年第7期59卷 1517-1518页

作者： XU JiYao LIU Xiao State Key laboratory of space weather National Space Science Center Chinese Academy of Sciences School of Mathematics and Information Science Henan Normal University

The ionosphere is composed of a large number of electrons and ions, which are produced by the photoionization effect of the solar radiation on the neutral atmosphere. The altitude range of ionosphere is about 60–1000 km and varies with local time and other factors （e.g., solar and geomagnetic activity）. Although the ionosphere varies over multiply timescales, the diurnal variation is in the dominant position due to the sun’s photoionization effect.

关键词： anomaly altitude neutral multiply latitude winter seasonal diurnal magnitude hemisphere

WIND observations of plasma waves inside the magnetic cloud boundary layers

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Chinese Science Bulletin 2005年第18期50卷 2051-2056页

作者： WEI Fengsi ZHONG Dingkun FENG Xueshang YANG Fang LIU Rui SIGMA weather Group Laboratory for Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100080 China Graduate School Chinese Academy of Sciences Beijing 100049 China

Based on the WIND observational data for the plasma waves from thermal noise receptor (TNR) working on the frequency 4―256 kHz and the solar wind and the magnetic fields, we analyze the plasma wave activities in the 60 magnetic cloud’s boundary layers (BLs) and find that there are often various plasma wave activities in the BLs, which are different from those in the adjacent solar wind (SW) and the magnetic clouds (MC). The basic characteris-tics are that: (1) the enhancement of the Langmuir wave near the electronic plasma frequency (fpe) is a dominant wave ac-tivity, which occupies 75% investigated samples; (2) the events enhanced both in the langmuir and ion acustic (f space developing space plasma wave theory.

关键词：边界层等离子体波磁场 Langmuir波频率分布

Investigation of the possible source for the solar energetic particle event on 2017 September 10

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Research in Astronomy and Astrophysics 2018年第7期18卷 1-10页

作者： Ming-Xian Zhao Gui-Ming Le Yu-Tian Chi Key laboratory of space weather National Center for Space WeatherChina Meteorological AdministrationBeijing 100081China School of Computer Science Anhui University of TechnologyMa'anshan 243032China School of Earth and space Sciences University of Science and Technology of ChinaHefei 230026China

According to the solar proton data observed by Geostationary Operational Environmental Satellites （GOES）, ground-based neutron monitors on Earth and near-relativistic electron data measured by the ACE spacecraft, the onset times of protons with different energies and near-relativistic electrons have been estimated and compared with the time of solar soft and hard X-ray and radio burst data. The results show that first arriving relativistic and non-relativistic protons and electrons may have been accelerated by the concurrent flare. The results also suggest that release times of protons with different energies may be different, and the protons with lower energy may have been released earlier than those with higher energy. Some protons accelerated by concurrent flares may be further accelerated by the shock driven by the associated CME.

关键词： Sun coronal mass ejections (CMEs) - Sun flares - Sun particle emission

Validation results of NmF2 and hmF2 derived from ionospheric density profiles of GNOS on FY-3C satellite

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Science China(Technological Sciences) 2018年第9期61卷 1372-1383页

作者： YANG GuangLin SUN YueQiang BAI WeiHua ZHANG XiaoXin LIU CongLiang MENG XiangGuang BI YanMeng WANG DongWei ZHAO DanYang National space Science Center China Academy of Sciences Beijing 100190 China Key laboratory of space weather National Center for Space Weather China Meteorological Administration Beijing 100081 China National Satellite Meteorological Center Beijing 100081 China Beijing Key laboratory of space Environment Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

The first Global Navigation Satellite System Occultation Sounder(GNOS) which is compatible of both Bei Dou System(BDS)and Global Positioning System(GPS) was successfully launched into orbit onboard the Feng Yun 3 C satellite(FY-3 C) on September 23, 2013, and it has already gathered a large amount of ionosphere radio occultation(RO) data so far. However, the detailed analysis and validation of GPS ionosphere RO data have not been done up to now. Therefore, this paper discusses the configuration of the FY-3 C GNOS, the methods and results of GPS ionosphere occultation processment, the quality analysis of the GPS ionosphere RO products, and the precision consistency between the GNOS GPS ionosphere RO product and ionosonde data. The peak electron density(Nm F2) correlation coefficient is 0.97, the corresponding standard deviation is 16.08%. The peak value altitude(hm F2) correlation coefficient is 0.89, and the corresponding standard deviation is 23.79 km. The in-orbit operation of GNOS provides a basis data set for the monitoring, forecasting and research of ionosphere's space weather.

关键词： radio occultation Global Navigation Satellite System BeiDou System ionosphere

Theoretical Study on Ion Escape in Martian Atmosphere

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Chinese Physics Letters 2007年第1期24卷 298-301页

作者：史建魁刘振兴 Klaus TORKAR Tielong ZHANG State Key laboratory for space weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100080 space Research Institute Austrian Academy of Sciences A-8042 Graz Austria

Based on the observation that Martian magnetic moment is gradually reducing from the ancient to the present, we investigate the O^＋ ion flux distribution along magnetic field lines and the ion escaping flux in Martian tail with different assumed Martian magnetic moments. The results show that the O^＋ ion flux along magnetic field lines decreases with distance from Mars; the ion flux along the field line decreases more quickly if the magnetic moment is larger; the larger the magnetic moment, the smaller the ion escaping flux in the Martian tail. The ion escaping flux depends on Z-coordinate in the Martian tail. With decrease of the magnetic moment, the ion escaping flux in the Martian tail increases. The results are significant for studying the water loss from Mars S uFface.

关键词： Mars surface Mars atmosphere Mars Mars magnetic field Ion fluxes Magnetic fields Ion escape