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Geomagnetic Responses Associated With Throat Aurora
Earth and Space Science ( IF 3.1 ) Pub Date : 2020-08-21 , DOI: 10.1029/2020ea001214
R. Selvakumaran 1 , D.‐S. Han 1 , S. Zhou 1, 2 , S. A. Gokani 1 , Y. L. Zhang 3
Affiliation  

Throat aurora is a special discrete auroral form often observed at the ionospheric convection throat region near magnetic local noon. Some observational properties of throat aurora have been established, but the geomagnetic response is not yet explored. Using geomagnetic observations from a chain of stations in the Norwegian sector and auroral observations from an all‐sky imager and the DMSP satellites, for the first time, we identify geomagnetic responses associated with the occurrence of throat aurora. These variations are well explained by combining the models of flux transfer events and throat aurora. The estimated increase in ionospheric equivalent current confirms the association of throat aurora with ground observations. The results provide further evidence for throat aurora being associated with magnetopause reconnection. Based on the observational features, a new association of geomagnetic variations with throat aurora may be defined to reflect their occurrence at high latitudes near local noon.

中文翻译:

喉极光相关的地磁响应

喉头极光是一种特殊的离散极光形式,通常在磁性局部正午附近的电离层对流喉头区域观察到。已经建立了喉头极光的一些观测特性,但尚未探索地磁响应。首次使用来自挪威扇形区域的一系列站点的地磁观测以及全天候成像仪和DMSP卫星的极光观测,我们确定了与喉极光发生有关的地磁响应。通过将通量传输事件和喉头极光的模型结合起来,可以很好地解释这些变化。电离层等效电流的估计增加证实了喉极光与地面观测的联系。该结果提供了进一步的证据表明喉头极光与磁更年期重新连接有关。
更新日期:2020-08-21
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