| 基于COSMIC掩星数据分析中低纬度地区电子密度分布变化 |
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| 引用本文： | 马新欣,金红林,李大虎.基于COSMIC掩星数据分析中低纬度地区电子密度分布变化[J].地震地磁观测与研究,2013(5):104-109. |
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| 作者姓名： | 马新欣 金红林 李大虎 |
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| 作者单位： | [1]中国地震局地球物理研究所,中国北京100081 [2]中国地震局地震预测研究所,中国北京100036 [3]四川省地震局工程地震研究院,中国成都610041 |
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| 基金项目： | 地震行业专项“山基塔基掩星和三频信标综合观测试验”（201108004）项目资助 |
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| 摘 要： | 利用COSMIC掩星2009年电子密度剖面数据,筛选数据进行网格划分,网格内数据统计平均,基于球谐函数计算模型值,分析电离层中低纬度地区最大电子密度的地磁季节变化、昼夜测分布相对变化,及地磁活动对电子密度的分布影响.结果表明,最大电子密度昼测值明显高于夜测值,在中纬度部分区域增大明显.电子密度昼测值在地磁活动期间高度150-550 km中低纬度范围为正相扰动,随纬度变化存在区域差异,随高度增加,扰动加强.
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| 关 键 词： | 电子密度 冬季异常 赤道异常 地磁活动 |
Analysis of the distribution variation of electron density at mid and low latitude based on COSMIC occultation data |
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| Ma Xinxin,Jin Honglin,Li Dahu.Analysis of the distribution variation of electron density at mid and low latitude based on COSMIC occultation data[J].Seismological and Geomagnetic Observation and Research,2013(5):104-109. |
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| Authors: | Ma Xinxin Jin Honglin Li Dahu |
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| Institution: | 1.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China; 2.Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China; 3.Institute of Engineering Seismology of Earthquake Administration Sichuan Province, Chengdu 610041,China;) |
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| Abstract: | Electron density profile data are collected in 2009 based on COSMIC occultation observation,and its statistical averages are calculated in each cell.Utilizing spherical harmonic function and calculating model values,we analyze the geomagnetic season variations of the maximum electron density and its distribution variations in the daytime and nighttime at mid and low latitude.We also discuss changes of electron density during geomagnetic activity.Research shows that the value of maximum electron density in the daytime was significantly higher than that of maximum electron density in the nighttime.Increase is particularly evident in the mid-latitude part of the region.The enhanced anomalous electron density disturbances took place from 150 km to 550 km altitude at mid and low latitude during geomagnetic activity.The values change with the latitude and increases with height. |
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| Keywords: | electron density winter anomaly equatorial anomaly geomagnetic activity |
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