Ionospheric Plasma Density Gradients Associated With Night‐Side Energetic Electron Precipitation
Ionospheric Plasma Density Gradients Associated With Night‐Side Energetic Electron Precipitation
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DOI：
10.1029/2023gl105630
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发表时间：
2023-11
影响因子：
5.2
通讯作者：
Xiao‐jia Zhang;X. Meng;A. Artemyev;Ying Zou;D. Mourenas
中科院分区：
文献类型：
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作者：
Xiao‐jia Zhang;X. Meng;A. Artemyev;Ying Zou;D. Mourenas
高能电子从赤道磁层沉淀到大气中，在磁层-电离层耦合中起着重要作用：沉淀电子改变电离层特性，而电离层流出则改变赤道等离子体条件，影响电磁波的产生和高能电子散射。然而，电离层测量不能与高海拔、近赤道航天器测量的波和高能电子特性直接相关，这是因为测绘的不确定性很大。我们的目标是通过将ELFIN CubeSats对高能电子降水的低空测量投影到总电子含量（TEC）地图上来解决这个问题，该地图作为电离层密度结构的代理。我们研究了三种类型的降水在夜面：500 keV的电子沉淀的EMIC波的沉淀。所有这三种类型的降水表现出不同的功能，在TEC水平梯度，我们讨论了这些功能可能产生的影响。
Energetic electron precipitation from the equatorial magnetosphere into the atmosphere plays an important role in magnetosphere‐ionosphere coupling: precipitating electrons alter ionospheric properties, whereas ionospheric outflows modify equatorial plasma conditions affecting electromagnetic wave generation and energetic electron scattering. However, ionospheric measurements cannot be directly related to wave and energetic electron properties measured by high‐altitude, near‐equatorial spacecraft, due to large mapping uncertainties. We aim to resolve this by projecting low‐altitude measurements of energetic electron precipitation by ELFIN CubeSats onto total electron content (TEC) maps serving as a proxy for ionospheric density structures. We examine three types of precipitation on the nightside: precipitation of 500 keV) electron precipitation by EMIC waves. All three types of precipitation show distinct features in TEC horizontal gradients, and we discuss possible implications of these features.