| 顶部电离层电子密度和温度的统计背景及其地磁活动变化 |
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| 引用本文： | 李柳元,杨俊英,曹晋滨,路立,吴云,杨冬梅.顶部电离层电子密度和温度的统计背景及其地磁活动变化[J].地球物理学报,2011,54(10):2437-2444. |
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| 作者姓名： | 李柳元 杨俊英 曹晋滨 路立 吴云 杨冬梅 |
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| 作者单位： | 1. 北京航空航天大学宇航学院,北京 100191;
2. 中国科学院空间天气学国家重点实验室,北京 100190;
3. 中国地震局地震研究所,武汉 430071;
4. 中国地震局地球物理研究所,北京 100081 |
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| 基金项目： | 国家科技支撑计划项目，国家自然科学基金，中国科学院空间中心所创新基金，973项目，中国科学院空间天气学国家重点实验室专项基金共同资助项目 |
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| 摘 要： | 通过对DEMETER卫星从2004年11月7日至2005年11月30日期间探测到的710 km高度顶部电离层的电子数据进行网格化(纬度2°×经度4°)统计平均,本文分析了不同地磁条件下顶部电离层电子密度和温度的全球分布情况.不论是在地磁宁静还是地磁活动期间,顶部电离层电子密度的分布都存在着一个巨大的威德尔海异常(夜间电...
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| 关 键 词： | 顶部电离层 电子密度 威德尔海异常 中纬槽 电子温度 |
| 收稿时间： | 2011-06-01 |
Statistical backgrounds of topside-ionospheric electron density and temperature and their variations during geomagnetic activity |
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| LI Liu-Yuan,YANG Jun-Ying,CAO Jin-Bin,LU Li,WU Yun,YANG Dong-Mei.Statistical backgrounds of topside-ionospheric electron density and temperature and their variations during geomagnetic activity[J].Chinese Journal of Geophysics,2011,54(10):2437-2444. |
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| Authors: | LI Liu-Yuan YANG Jun-Ying CAO Jin-Bin LU Li WU Yun YANG Dong-Mei |
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| Institution: | 1. School of Astronautics, BeiHang University, Beijing 100191, China;
2. State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, China;
3. Institute of Seismology, China Earthquake Administration, Wuhan 430071, China;
4. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | Electron density and temperature measured by DEMETER satellite at 710 km altitude from 17 November 2004 to 30 November 2005 are collected, and their statistical averages are calculated in each geographic cells of 2°(lat) ×4°(lon) under different geomagnetic conditions. The statistical results indicate that whenever the geomagnetically quiet or active times the electron density distribution has a large Wedell Sea Anomaly (WSA) region (30°W~180°W and 30°S~75°S, where the nighttime density of plasma is larger than the daytime) and the low-density nighttime midlatitude trough (MIT) regions (35°N~60°N and 35°S~60°S) in the topside ionosphere, and the electron density is maximum near the magnetic dip equator (±20°), indicating that Equatorial Ionization Anomaly (EIA) does not exist in the topside ionosphere of 710 km altitude. Though the geomagnetic activity causes the global increase of electron density and the latitude expanding of equatorial density peak, it does not obviously change the spatial ranges of the WSA and MIT regions. In contrast to the electron density distribution, the electron temperature is the minimum near the magnetic dip equator, whereas it is the maximum near the plasmapause, and the geomagnetic activity merely leads to the increase of electron temperature near the plasmapause. |
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| Keywords: | Topside ionosphere Electron density Wedell Sea Anomaly Midlatitude trough Electron temperature |
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