利用小波分析研究近地空间高能电子的周期变化特征
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1. 西藏大学理学院物理系 拉萨 850000;2. 中国科学院上海应用物理研究所 上海 201800;3. 中国科学院大学核科学与技术学院 北京 100049;4. 中国科学院上海高等研究院 上海 201210;5. 西藏大学珠峰研究院 拉萨 850000

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P172;

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国家自然科学基金项目(11803024、11747128), 西藏自治区自然科学基金项目(XZ2019ZRG-163), 西藏大学教师学历提升``博士后计划'', 西藏大学理学院2019院级教改项目及西藏大学理学院2020院级自选项目资助


Researches on the Periodic Variation Characteristics of High-energy Electrons in Near-earth Space by Using the Wavelet Analysis
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1. Department of Physics, College of Science, Tibet University, Lhasa 850000;2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800;3. College of Nuclear Science and Technology, University of Chinese Academy of Sciences, \lk Beijing 100049;4. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210;5. Mount Everest Research Institute, Tibet University, Lhasa 850000;

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    摘要:

    利用小波变换对GOES (Geostationary Operational Environmental Satellites)系列卫星(GOES 10/11) 1999年3月至2010年12月和风云2号系列卫星(FY 2C/2D) 2004年\lk 10月至2012年5月记录的$\geqslant $ 2MeV高能电子通量变化情况进行了相关研究, 发现GOES卫星观测到的高能电子通量存在明显的13.9d、27.7d、187.0d和342.9d周期, FY卫星观测到的高能电子通量存在明显的13.9d、27.7d、222.3d和374.0d周期, 在某些年份\lk GOES和FY卫星均存在9d的周期, 与地磁Dst (赤道环电流指数)、 AE (极光电射流指数)指数周期高度相似. 将高能电子通量和Dst、AE指数进行交叉小波分析, 并利用该算法的多分辨率特点以及时域、频域局部化分析方法, 将数据按不同频率进行分解, 从低频系数重构图像和交叉小波谱图可以清楚看出高能电子通量和地磁指数的关系. 基于\lk FY和GOES卫星高能电子通量良好的相关性, 对多卫星高能电子通量变化短周期相同、中长周期不同进一步研究, 对比发现不同地磁扰动引起的GOES和FY卫星高能电子通量变化存在各向异性, 小磁暴也可以对高能电子通量造成和强磁暴一样的效果, 并且某些时候存在地方时一致的24h周期. 这一结果表明对地磁宁静期高能电子研究至关重要, 同时对理解太阳活动, 预报高能电子能谱和预警深层充电事件以及验证预测磁暴、亚暴等事件具有重要意义.

    Abstract:

    The variation of high-energy electron flux of GOES (Geostationary Operational Environmental Satellites) series satellites (GOES 10/11) from March 1999 to December 2010 and Fengyun-2 series satellites (FY 2C/2D) from October 2004 to May 2012 was studied by applying wavelet transformation. We found that the high-energy electrons observed by GOES are periodic and the periods are 13.9-day, 27.7-day, 187.0-day and 342.9-day. There are obvious 13.9-day, 27.7-day, 222.3-day and 374.0-day cycles for the high-energy electrons observed by FY. In some years, GOES and FY satellites both have a period of 9-day, which is highly similar to the geomagnetic Dst (equatorial ring current index) and AE (laser charged jet index) index cycles. We carry out the overlapping wavelet analysis of the high-energy electron flux and Dst and AE indexes. The data are finally decomposed at different frequencies by using the localization analysis methods of time domain and frequency domain based on the multi-resolution characteristics of the algorithm. So that the relationship between high-energy electron flux and geomagnetic index can be clearly seen from the reconstructed image of low-frequency coefficient and the crossed wavelet spectrum. Based on the good correlation of the high-energy electrons between the FY and GOES satellites, we made a further study of the same short period and different medium-to-long periods on multiple satellites. The anisotropy of high-energy electron flux in different geomagnetic disturbances is found. Small magnetic storms can also have the same effect on electron flux as strong ones, and sometimes exist in the same 24-hour cycle corresponding to local time. It is very important for us to study high-energy electrons in geomagnetic quiet period. At the same time, it is of great significance for understanding solar activity, predicting high-energy electron spectrum, warning deep charging events and verifying the magnetic storms and substorms.

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廖偲含,王宏伟,鲁同所,杨兴,匡攀.利用小波分析研究近地空间高能电子的周期变化特征[J].天文学报,2021,62(3):27. LIAO Si-han, WANG Hong-wei, LU Tong-suo, YANG Xing, KUANG Pan. Researches on the Periodic Variation Characteristics of High-energy Electrons in Near-earth Space by Using the Wavelet Analysis[J]. Acta Astronomica Sinica,2021,62(3):27.

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  • 收稿日期:2020-08-20
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  • 在线发布日期: 2021-06-07
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