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A cceleration of Ionospheric Out-Flowing Ions in the Substorm in Geo-magnetotail

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Chinese Physics Letters 1999年第12期16卷 908-910页

作者： SHI Jian-kui LIU Zhen-Xing T.L.Zhang k.torkar Center for Space Science&Applied Research Chinese Academy of SciencesBeijing 100080 Space Research Institute Austrian Academy of SciencesA-8010 GrazAustria

Using dynamics equation, acceleration of out-flowing ion during dipolarization in a substorm in the magneto-tail is simulated. The main results show that: (1) The ion distribution function that is initially exponentially decreasing with increasing speed is turned into a single peak distribution, and with time the peak moves towards higher speed. (2) The peak moves along V⊥ faster than that along V||, and the ion acceleration mainly occurs in the middle of the dipolarization. (3) The higher the initial energy, the faster the peak moves, and the more energy is obtained by the ions. The ion energy theoretically calculated is as high as about 102 keV, this is consistent with the observation.

关键词： storm faster acceleration

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火星磁层中尾向磁场对O^+离子分布的影响

中国科学（E辑） 2001年第6期31卷 502-507页

作者：史建魁刘振兴 T.L.Zhang k.torkar 中国科学院空间科学与应用研究中心北京100080 Space Research Institute Austrian Academy of Sciences

在与地球对比的基础上,采用LB磁场模型,根据由动力学方程求解得到的分布函数,研究了火星磁层中不同尾向磁场条件下来自电离层的O+离子沿磁力线的分布。结果发现火星磁尾区O+离子通量密度受火星与太阳风相互作用而产生的感应型尾向磁场... 详细信息

在与地球对比的基础上,采用LB磁场模型,根据由动力学方程求解得到的分布函数,研究了火星磁层中不同尾向磁场条件下来自电离层的O+离子沿磁力线的分布。结果发现火星磁尾区O+离子通量密度受火星与太阳风相互作用而产生的感应型尾向磁场的影响:（i）火星磁尾O+离子通量密度随尾向磁场的增强而增大,当尾向磁场由5nT增大到20nT时,磁尾2.8Rm（Rm为火星半径）处O+离子通量密度可增大3倍左右;（ii）火星磁尾O+离子通量密度随内禀磁矩的增大而减小,当内禀磁矩增大半个量级时,磁尾2.8Rm处O+离子通量密度可减小到25％左右.根据实际观测得到的O+在不同火星磁层区的数据和本文的理论曲线,推测得火星的内禀磁矩约为2×1017T·cm3,这与美国最新的火星探测飞船MGS观测结果一致.

关键词：火星尾向磁场 O^+离子通量密度内禀磁矩分布函数磁层磁力线

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火星磁层中内禀磁场对O^+离子分布的影响

科学通报 1997年第17期42卷 1850-1853页

作者：史建魁刘振兴 T.L.Zhang k.torkar 中国科学院空间科学与应用研究中心北京100080 奥地利科学院空间研究所

目前对火星磁层的观测仅是在某些特定情况下和特殊位置的观测,并无系统的数据;在理论研究方面,仅对火星磁层顶位形进行过一些探讨.火星磁层的结构、磁矩的大小(即内禀磁场)及其在火星磁层中的动力学作用问题,仍然是有争论的,有待于进一... 详细信息

目前对火星磁层的观测仅是在某些特定情况下和特殊位置的观测,并无系统的数据;在理论研究方面,仅对火星磁层顶位形进行过一些探讨.火星磁层的结构、磁矩的大小(即内禀磁场)及其在火星磁层中的动力学作用问题,仍然是有争论的,有待于进一步系统地观测分析和理论研究来确定.观测结果还表明,氧离子是火星磁尾重要的离子成分,其通量密度典型值为 2.5 ×10~7cm^(-2)·s^(-1).

关键词：火星磁层离子分布内禀磁场氧离子

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： Ion Escape Martian Atmosphere Mars surface

A Model for the Sounding Rocket Measurement on an Ionospheric E-F Valley at the Hainan Low Latitude Station

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Plasma Science and Technology 2014年第4期16卷 316-319页

作者：王铮史建魁关燚炳刘超朱光武 klaus torkar Martin FREDRICH National Space Science Center Chinese Academy of Sciences Space Research Institute Austrian Academy of Sciences Graz Technique University

To understand the physics of an ionospheric E-F valley, a new overlapping three- Chapman-layer model is developed to interpret the sounding rocket measurement in the morn- ing （sunrise） on May 7, 2011 at the Hainan low latitude ionospheric observation station （19.5°N, 109.1°E）. From our model, the valley width, depth and height are 43.0 km, 62.9% and 121.0 km, re- spectively. From the sounding rocket observation, the valley width, depth and height are 42.2 km, 47.0% and 123.5 km, respectively. The model results are well consistent with the sounding rocket observation. The observed E-F valley at Hainan station is very wide and deep, and rapid deel- opment of the photochemical process in the ionosphere should be the underlying reason.

关键词： Chapman theory overlapping three-layer model ionospheric E-F valley

Clarification on Polarity of Bipolar Electric Field Solitary Structures in Space Plasmas with Satellite Observation

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Chinese Physics Letters 2011年第2期28卷 164-167页

作者： M.N.S.Qureshi SHI Jian-kui klaus torkar LIU Zhen-Xing Department of Physics GC UniversityLahore 54000Pakistan State key Laboratory of Space Weather Centre for Space Science and Applied Research(CSSAR)Chinese Academy of SciencesBeijing 100190 Space Research Institute Austrian Academy of SciencesA-8042GrazAustria

The bipolar electric field solitary(EFS)structures observed frequently in space plasmas by satellites have two different polarities,first positive electric field peak then negative(i.e.,positive/negative)and first negative then positive peak(i.e.,negative/positive).We provide the physical explanation on the polarity of observed bipolar EFS structures with an electrostatic ion fluid *** results show that if initial electric field𝐸E_(0)>0,the polarity of the bipolar EFS structure will be positive/negative;and if𝐸E_(0)<0,the polarity of the bipolar EFS structure will be negative/***,for a fixed polarity of the EFS,either positive/negative or negative/positive,if the satellite is located at the positive side of the EFS,the observed polarity should be positive/negative,if the satellite is located at the negative side of the EFS,the observed polarity should be negative/***,we provide a method to clarify the natural polarity of the EFS with observed polarity by *** results are significant to understand the physical process in space plasma with the satellite observation.

关键词： Observation polarity bipolar

地球磁层极尖区场向电子事件期间能量特性研究

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空间科学学报 2016年第6期36卷 849-856页

作者：史建魁张子迎 torkar klaus 王铮程征伟王国军中国科学院国家空间科学中心空间天气学国家重点实验室北京100190 中国科学院大学北京100049 北京联合大学应用文理学院北京100191 Space Research Institute Austrian Academy of SciencesGrazAustriaA-8042

根据Cluster卫星2001年9月30日在北半球极尖区观测到的一次强扰动场向电子事件数据,分析研究了这次事件期间场向电子的能量特性,讨论了场向电子对太阳风能量向磁层的传输和磁层-电离层耦合过程中能量传输的作用.分析认为,这次电子扰动... 详细信息

根据Cluster卫星2001年9月30日在北半球极尖区观测到的一次强扰动场向电子事件数据,分析研究了这次事件期间场向电子的能量特性,讨论了场向电子对太阳风能量向磁层的传输和磁层-电离层耦合过程中能量传输的作用.分析认为,这次电子扰动事件期间电子速度和密度都具有很强的扰动变化,电子速度增加是一个主要特点.本次事件中低能段5~200 eV和500~1500 eV内的能谱分析结果表明,上行电子通量大于下行电子通量,上行电子主要来源于电离层,说明电离层上行电子在本次事件中具有非常活跃的作用.根据电离层中带电粒子的能量特征分析结果可知,这次事件中电离层起源的上行电子在上行过程中得到了加速.关于加速机制问题还有待深入研究.

关键词：极尖区场向电子能量特性电离层起源

Investigation on Ionospheric Structures by Sounding Rocket and Collaboration with ZH-Satellite Observation

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Investigation on Ionospheric Structures by Sounding Rocket a...

2020年中国地球科学联合学术年会

作者： Shi Jiankui Wang Zheng Guan Yibing klaus torkar Wang Xiao Wang Guojun Liu Chao National Space Science Center/Chinese Academy of Sciences Space Research Institute/Austrian Academy of Sciences

The ionospheric E-F valley is a precision structure in the ionospheric electron density profile. The plasma density decreases in the E-F valley which could not be detected by ionosonde. The sounding rocket is an important tool to perform in-situ measurement of the E-F valley. At Hainan ionospheric observatory station a sounding rocket was launched on May 7, 2011.

关键词： Investigation on Ionospheric Structures by Sounding Rocket and Collaboration with ZH-Satellite Observation

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顶部电离层中双极电场特性研究(英文)

顶部电离层中双极电场特性研究(英文)