Extension of the Electron Density Enhancement From Middle to High Latitudes Observed by Swarm‐A in Summer of the Southern Hemisphere

Extension of the Electron Density Enhancement From Middle to High Latitudes Observed by Swarm‐A in Summer of the Southern Hemisphere
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Swarm-A在南半球夏季观测到的电子密度增强从中纬度到高纬度的扩展

DOI:
10.1029/2021ja029406
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发表时间:
2022-09
期刊:
Journal of Geophysical Research: Space Physics
影响因子:
--
通讯作者:
Yifan Qi
Yifan Qi
中科院分区:
其他
文献类型:
--
作者:
Jin Wang;Yang‐Yi Sun;Tao Yu;Gang Chen;Hailun Ye;Xiangxiang Yan;Na Yang;Yifan Qi

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与南部中纬度夏季夜间异常(MSNA)相关的电子密度(Ne)增强向东收缩的主要因果机制归因于固定本地时间坐标中地磁纬度中层的热层中性风。研究中,Swarm-A卫星在462 km高度观测到的Ne和水平跨轨离子漂移表明,水平漂移可以驱动南半球局地夏季MSNA南部的Ne增强。向东和向西的离子漂移都将增强从地磁中纬度传送到高地磁纬度,导致增强在全天所有经度上演化。
The major causal mechanism for the eastward contraction of the electron density (Ne) enhancement associated with the southern Midlatitude Summer Nighttime Anomaly (MSNA) was attributed to the thermospheric neutral wind at the middle geomagnetic latitude in the fixed local time coordinate. In the study, the Ne and horizontal cross‐track ion drifts observed by the Swarm‐A satellite at 462 km altitude show that the horizontal drifts can drive the Ne enhancement of the southern MSNA in the local summer of the Southern Hemisphere. Both the eastward and westward ion drifts transport the enhancement from the middle to the high geomagnetic latitudes, which results in the enhancement evolving at all the longitudes in the whole day.
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