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中国空间磁层线辐射现象探究

盛雪莲 吴静 张翀

盛雪莲, 吴静, 张翀等 . 中国空间磁层线辐射现象探究[J]. 北京航空航天大学学报, 2018, 44(7): 1504-1513. doi: 10.13700/j.bh.1001-5965.2017.0525
引用本文: 盛雪莲, 吴静, 张翀等 . 中国空间磁层线辐射现象探究[J]. 北京航空航天大学学报, 2018, 44(7): 1504-1513. doi: 10.13700/j.bh.1001-5965.2017.0525
SHENG Xuelian, WU Jing, ZHANG Chonget al. Space magnetospheric line radiation above China[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(7): 1504-1513. doi: 10.13700/j.bh.1001-5965.2017.0525(in Chinese)
Citation: SHENG Xuelian, WU Jing, ZHANG Chonget al. Space magnetospheric line radiation above China[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(7): 1504-1513. doi: 10.13700/j.bh.1001-5965.2017.0525(in Chinese)

中国空间磁层线辐射现象探究

doi: 10.13700/j.bh.1001-5965.2017.0525
基金项目: 

国家自然科学基金 51207006

详细信息
    作者简介:

    盛雪莲  女, 硕士研究生。主要研究方向:电离层中的特殊辐射现象

    吴静  女, 博士, 副教授。主要研究方向:电磁场理论及其应用

    通讯作者:

    吴静, E-mail:wujing06@buaa.edu.cn

  • 中图分类号: P352.7

Space magnetospheric line radiation above China

Funds: 

National Natural Science Foundation of China 51207006

More Information
  • 摘要:

    对2008—2010年覆盖中国空间的DEMETER卫星电场探测数据进行分析,共识别出328例磁层线辐射(MLR)事件。根据已有MLR事件的频谱特征,研究了中国空间的MLR事件的特征及其可能的原因。对所有MLR事件进行统计分析,结果表明这些事件白昼的出现率高于夜晚,秋冬季的出现率高于春夏季;与地磁活动水平无明显关联,主要出现在中国中低纬度地区空间;频率间隔主要分布在55~95 Hz,频率漂移速率大都在0~0.4 Hz/s,并且频谱最高强度与地理纬度无明确关联。中国空间MLR事件的特征与中国空间所观测到的电力线谐波辐射(PLHR)事件的特征相似,与国外已发现的MLR事件的特征有所不同。

     

  • 图 1  利用DEMETER卫星探测到的各种线状辐射现象[20]

    Figure 1.  Line radiations detected by DEMETER satellite[20]

    图 2  第1类MLR事件时频功率密度谱

    Figure 2.  Time-frequency power density spectrogram of the first type of MLR events

    图 3  第2类MLR事件时频功率密度谱

    Figure 3.  Time-frequency power density spectrogram of the second type of MLR events

    图 4  第3类MLR事件时频功率密度谱

    Figure 4.  Time-frequency power density spectrogram of the third type of MLR events

    图 5  典型白昼和夜晚MLR事件的时频功率密度谱

    Figure 5.  Time-frequency power density spectrogram of typical MLR events in daytime and nighttime

    图 6  典型夏季和冬季MLR事件的时频功率密度谱

    Figure 6.  Time-frequency power density spectrogram of typical MLR events in summer and winter

    图 7  Kp指数分布直方图

    Figure 7.  Kp indices distribution histogram

    图 8  MLR事件的中心点纬度与频谱最高强度分布

    Figure 8.  Distribution of MLR events' central point latitude and frequency spectrum peak intensity

    表  1  2008—2010年中国空间MLR事件按月份分布统计

    Table  1.   Monthly distribution of MLR events in space above China from 2008 to 2010

    年份 1月 2月 3月 4月 5月 6月 7月 8月 9月 10月 11月 12月 总计
    2008年 11 6 4 9 10 7 7 5 5 7 13 19 103
    2009年 15 4 3 13 9 10 14 3 5 16 16 20 128
    2010年 12 11 7 5 9 10 9 10 6 9 9 97
    总计 38 21 14 27 28 27 30 18 16 32 38 39 328
    下载: 导出CSV

    表  2  2008春季至2009年冬季中国空间MLR事件按季节分布统计

    Table  2.   Seasonal distribution of MLR events in space above China from spring of 2008 to winter of 2009

    季节 2008年 2009年
    事件数 事件比例/% 事件数 事件比例/%
    23 21.9 25 18.9
    19 18.1 27 20.5
    25 23.8 37 28.0
    38 36.2 43 32.6
    总计 105 100 132 100
    下载: 导出CSV

    表  3  MLR事件频率间隔分布

    Table  3.   Distribution of MLR events' frequency spacing

    频率间隔/Hz MLR事件数量
    0~30 2
    55~65 2
    65~75 32
    75~85 49
    85~95 24
    95~105 8
    105~115 9
    115~125 4
    125~135 5
    下载: 导出CSV

    表  4  MLR事件的频率漂移速率分布

    Table  4.   Distribution of MLR events' frequency drift rate

    频率漂移速率/(Hz·s-1) MLR事件数量
    0~0.2 76
    0.2~0.4 51
    0.4~0.6 6
    0.6~0.8 1
    0.8~1.0 1
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-08-11
  • 录用日期:  2017-12-22
  • 刊出日期:  2018-07-20

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