Statistical Study of Magnetospheric Conditions for SAPS and SAID
Statistical Study of Magnetospheric Conditions for SAPS and SAID
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DOI：
10.1029/2022gl098469
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发表时间：
2022
影响因子：
5.2
通讯作者：
Y. Nishimura;A. Hussein;P. Erickson;B. Gallardo‐Lacourt;V. Angelopoulos
中科院分区：
文献类型：
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作者：
Y. Nishimura;A. Hussein;P. Erickson;B. Gallardo‐Lacourt;V. Angelopoulos
利用亚暴和RBSP观测期间的事件时程和大尺度相互作用，对亚极光极化流(SAPS)和亚极光离子漂移(SAID)的磁层内条件进行了统计研究。我们发现SAID在其地球边缘的等离子体片电子通量比SAPS大。Said的环电流离子通量在Said附近形成了一个局部极大值，但Said的离子通量不一定大于SAPS。Said和SAPS的潜在降幅中值几乎相同，但Strong Said的潜在降幅远远大于SAPS。赛义德的等离子体顶更尖锐，电磁波更强烈。上述速度峰值与太阳风或地磁指数没有很强的相关性。这些结果表明，与全球磁层条件相比，局地等离子体结构对SAPS/SAID速度特性更为重要。
Inner‐magnetospheric conditions for subauroral polarization streams (SAPS) and subauroral ion drifts (SAID) have been investigated statistically using Time History of Events and Macroscale Interactions during Substorms and RBSP observations. We found that plasma sheet electron fluxes at its earthward edge are larger for SAID than SAPS. The ring current ion flux for SAID formed a local maximum near SAID, but the ion flux for SAID was not necessarily larger than for SAPS. The median potential drop across SAID and SAPS is nearly the same, but the potential drop for intense SAID is substantially larger than that for SAPS. The plasmapause is sharper and electromagnetic waves were more intense for SAID. The SAID velocity peak does not strongly correlate with solar wind or geomagnetic indices. These results indicate that local plasma structures are more important for SAPS/SAID velocity characteristics as compared to global magnetospheric conditions.