Asymmetric Distributions of Auroral Kilometric Radiation in Earth's Northern and Southern Hemispheres Observed by the Arase Satellite
Asymmetric Distributions of Auroral Kilometric Radiation in Earth's Northern and Southern Hemispheres Observed by the Arase Satellite
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DOI：
10.1029/2022gl099571
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发表时间：
2022-06
影响因子：
5.2
通讯作者：
F. Xiao;Jiawen Tang;Sai Zhang;Qinghua Zhou;Si Liu;Yihua He;Qiwu Yang;Y. Kasahara;Y. Miyoshi-Y.-M
中科院分区：
文献类型：
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作者：
F. Xiao;Jiawen Tang;Sai Zhang;Qinghua Zhou;Si Liu;Yihua He;Qiwu Yang;Y. Kasahara;Y. Miyoshi-Y.-M
极光公里辐射(AKR)是在高纬度产生的，可以向下传播到低纬度。由于缺乏直接观测，目前还没有对两个半球中低纬地区的AKR特征进行研究。本文利用2017年3月23日至2019年7月31日对ARASE卫星的观测，首次统计研究了北半球(磁纬MLAT=0°-40°)和南半球(MLAT=−40°-0°)的AKR分布。结果表明，北(南)半球AKR的出现率较高(>；30%)，主要停留在磁局地时MLT=17-24(MLT=21-05)区域。在北(南)半球，大约60%的波样本是在≤300千赫(>；300千赫)的频率范围内观察到的。AKR在两个半球的不对称分布可以进一步丰富我们对AKR的理解。
Auroral kilometric radiation (AKR) is generated at high latitudes and can propagate down to low latitudes. Due to the lack of direct observations, the characteristics of AKR in the middle and low latitudes of two hemispheres have not been studied so far. Here, using observations of the Arase satellite from 23 March 2017 to 31 July 2019, we present the first statistical study of AKR distribution in the northern (Magnetic latitude Mlat = 0°–40°) and southern (Mlat = −40°–0°) hemispheres. Results (totally 30,353 samples) show that relatively high occurrence rates (>30%) of AKR in the northern (southern) hemisphere primarily stay in the region of magnetic local time MLT = 17–24 (MLT = 21–05). About 60% of wave samples in the northern (southern) hemisphere are observed in the frequency range of ≤300 kHz (>300 kHz). The asymmetric distribution in two hemispheres can further enrich our understanding of AKR.