Isolated Proton Aurora Driven by EMIC Pc1 Wave: PWING, Swarm, and NOAA POES Multi‐Instrument Observations
Isolated Proton Aurora Driven by EMIC Pc1 Wave: PWING, Swarm, and NOAA POES Multi‐Instrument Observations
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DOI：
10.1029/2021gl095090
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发表时间：
2021-09
影响因子：
5.2
通讯作者：
Hyangpyo Kim;K. Shiokawa;Jaeheung Park;Y. Miyoshi;Y. Miyashita;C. Stolle;H. Connor;J. Hwang;S. Buchert;H. Kwon;Satoko Nakamura;K. Nakamura;S. Oyama;Y. Otsuka;T. Nagatsuma;K. Sakaguchi
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作者：
Hyangpyo Kim;K. Shiokawa;Jaeheung Park;Y. Miyoshi;Y. Miyashita;C. Stolle;H. Connor;J. Hwang;S. Buchert;H. Kwon;Satoko Nakamura;K. Nakamura;S. Oyama;Y. Otsuka;T. Nagatsuma;K. Sakaguchi
我们报告了与电磁离子回旋Pc 1波相关的孤立质子极光（IPAs）上方F区等离子体变化和场向电流（FACs）的同步观测结果。2020年3月19日和2018年9月12日的关键事件表明，地面磁力计和全天空成像仪检测到了同时发生的Pc 1波和IPA，在此期间，NOAA POES观测到了高能质子的沉淀。在IPA区上方的电离层F层中，Swarm卫星观测到横向Pc 1波，其跨越的纬度比IPA更宽。在IPA周围，Swarm还检测到双极FAC和局部等离子体密度增强，偶尔被宽/浅耗尽包围。这表明波致质子沉淀有助于从磁层到电离层的能量转移。
We report the concurrent observations of F‐region plasma changes and field‐aligned currents (FACs) above isolated proton auroras (IPAs) associated with electromagnetic ion cyclotron Pc1 waves. Key events on March 19, 2020 and September 12, 2018 show that ground magnetometers and all‐sky imagers detected concurrent Pc1 wave and IPA, during which NOAA POES observed precipitating energetic protons. In the ionospheric F‐layer above the IPA zone, the Swarm satellites observed transverse Pc1 waves, which span wider latitudes than IPA. Around IPA, Swarm also detected the bipolar FAC and localized plasma density enhancement, which is occasionally surrounded by wide/shallow depletion. This indicates that wave‐induced proton precipitation contributes to the energy transfer from the magnetosphere to the ionosphere.