| 利用COSMIC低轨卫星对GPS信号的顶部TEC观测资料研究等离子体层电子含量的变化特征 |
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| 引用本文： | 张满莲,刘立波,万卫星,宁百齐.利用COSMIC低轨卫星对GPS信号的顶部TEC观测资料研究等离子体层电子含量的变化特征[J].地球物理学报,2016,59(1):1-7. |
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| 作者姓名： | 张满莲 刘立波 万卫星 宁百齐 |
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| 作者单位： | 中国科学院地质与地球物理研究所, 中国科学院地球与行星物理重点实验室, 北京 100029 |
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| 基金项目： | 国家自然科学基金(41274163)、国家重点基础研究发展计划(973计划)(2012CB825604)、中国科学院重点部署项目(KZZD-EW-01-03)、国家自然科学基金创新群体项目(41321003)以及国家自然科学基金重点项目(41231065)资助. |
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| 摘 要： | 本文尝试利用COSMIC低轨卫星对GPS信号的顶部TEC观测资料研究等离子体层电子含量(简称PEC)的变化规律.首先介绍从低轨卫星对GPS的顶部TEC观测资料提取等离子体层垂直电子含量的方法,然后利用该方法提取2008年全年的PEC数据,进而研究了2008年这一太阳活动低年PEC随地磁纬度(MLAT)、磁地方时(MLT)以及不同季节的变化规律.此外,还利用提取的120°E和300°E经度链上的数据对比研究了PEC的经度变化情形.研究结果表明:(1)PEC主要集中分布在磁赤道±45°之间的一个绕地球的环带状区域中;(2)PEC表现出以下的昼夜变化规律特征:白天时段之值高于夜间,约在12—16MLT之间达到最高峰值,而最小PEC值出现在日出前大约4—5MLT左右的时段;(3)相比其他季节月份而言,PEC在北半球夏季月份(5—8月)具有最小值;(4)PEC存在明显的经度变化,不同经度链上的PEC存在不同的季节变化特征.
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| 关 键 词： | 等离子体层 电离层 总电子含量(TEC) 等离子体层电子含量 |
| 收稿时间： | 2015-08-02 |
Variation of the plasmaspheric electron content derived from the podTEC observations of COSMIC LEO satellites to GPS signals |
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| ZHANG Man-Lian,LIU Li-Bo,WAN Wei-Xing,NING Bai-Qi.Variation of the plasmaspheric electron content derived from the podTEC observations of COSMIC LEO satellites to GPS signals[J].Chinese Journal of Geophysics,2016,59(1):1-7. |
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| Authors: | ZHANG Man-Lian LIU Li-Bo WAN Wei-Xing NING Bai-Qi |
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| Institution: | Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | We tried to study the variations of the plasmaspheric electron content(PEC) using the PEC data derived from the podTEC observation of the COSMIC low Earth orbit(LEO) satellite to the GPS satellite signals. We first give a brief introduce to the method we used to convert the slant podTEC to the vertical PEC. Then we used the converted PEC data of the year 2008 to study the variations of PEC with the geomagnetic latitude(MLAT), magnetic local time(MLT) and with four different seasons. Besides, we made a study on the longitudinal variation of PEC using the extracted PEC data from two different longitudes(120°E and 300°E). Our study showed that:(1) The distribution of PEC is mainly confined to a region within±45° of the magnetic equator of the Earth;(2) PEC shows a well-defined diurnal variation pattern with higher values during daytime hours than during nighttime hours. PEC reaches its peak value at the hour around 12-16MLT, whereas it reaches its minimum value at around 4-5MLT.(3) PEC has a lowest value in the June solstice season(May-August) compared with other seasons.(4) PEC shows an evident longitudinal variation and it has different seasonal variations for different longitudes. |
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| Keywords: | Plasmasphere Ionosphere Total Electron Content(TEC) Plasmaspheric electron content |
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