Global Distribution of Nighttime Medium‐Scale Traveling Ionospheric Disturbances Seen by Swarm Satellites
Global Distribution of Nighttime Medium‐Scale Traveling Ionospheric Disturbances Seen by Swarm Satellites
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DOI：
10.1002/2017gl074750
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发表时间：
2017-09
影响因子：
5.2
通讯作者：
H. Kil;L. Paxton
中科院分区：
文献类型：
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作者：
H. Kil;L. Paxton
利用Swarm卫星的电子密度测量，研究了中纬度（±25°-40°磁纬）地区夜间中尺度移动电离层扰动（MSTID）的活动。采用分数电子密度波动作为MSTID的代表，MSTID分布来源于2013年12月至2017年1月的观测数据。MSTID活动在大多数经度呈半年变化，主要高峰和次要高峰分别出现在6月至和12月至。MSTID分布的显著特征是6 - 8月在东经150°附近的MSTID发生率较高。mstid的纵向分布和年分布呈半球对称，我们认为这证明了mstid的共轭性。
The activity of nighttime medium‐scale traveling ionospheric disturbance (MSTID) in middle latitudes (±25°–40° magnetic latitudes) is investigated using the measurements of the electron density by Swarm satellites. Fractional electron density fluctuation is used as a proxy for MSTIDs, and the MSTID distribution is derived from the observations in December 2013–January 2017. The MSTID activity shows a semiannual variation in most longitudes with the primary and secondary peaks during the June and December solstices, respectively. The distinguishing feature in the MSTID distribution is the high occurrence rate of MSTIDs around 150°E longitude in June–August. The longitudinal and annual distribution of MSTIDs shows a hemispheric symmetry, which we interpret as the demonstration of conjugacy in MSTIDs.