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DOI | 10.1029/2020GL090261 |
A New Type of Polar Cap Arc Observed in the ~1500MLT Sector: 1. Northern Hemisphere Observations | |
De‐; Sheng Han; Hui‐; Ting Feng; Hong Zhang; Su Zhou; Y.‐; L. Zhang | |
2020-10-07 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2020 |
英文摘要 | A new type of polar cap aurora observed in ~ 1500MLT sector, abbreviated as 15MLT‐PCA, is identified on examining the long‐term spectrographic imager observations on the DMSP satellite over the Nothern Hemisphere. Apparent dependencies of 15MLT‐PCA on the solar cycle, season, universal time, and interplanetary magnetic field (IMF) are presented, which indicate that the 15MLT‐PCA occurs in the northern summer under conditions of large dipole tilt angle, long‐lasting positive IMF By, and predominant negative Bx. The IMF Bz and other solar wind conditions show less control over the occurrence of 15MLT‐PCA. The particle precipitations of 15MLT‐PCA show magnetosheath‐like or mantle‐like properties with the ions showing clear energy dispersion property. We suggest that the 15MLT‐PCA is caused by reconnection between a twisted lobe field line and an anti‐sunward IMF field line, which differs from the mechanism for High‐latitude dayside aurora (HiLDA) that share some common observational features with the 15MLT‐PCA. |
领域 | 气候变化 |
URL | 查看原文 |
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文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/297966 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | De‐,Sheng Han,Hui‐,et al. A New Type of Polar Cap Arc Observed in the ~1500MLT Sector: 1. Northern Hemisphere Observations[J]. Geophysical Research Letters,2020. |
APA | De‐.,Sheng Han.,Hui‐.,Ting Feng.,Hong Zhang.,...&L. Zhang.(2020).A New Type of Polar Cap Arc Observed in the ~1500MLT Sector: 1. Northern Hemisphere Observations.Geophysical Research Letters. |
MLA | De‐,et al."A New Type of Polar Cap Arc Observed in the ~1500MLT Sector: 1. Northern Hemisphere Observations".Geophysical Research Letters (2020). |
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