Statistical Evidence for EMIC wave Excitation Driven by Substorm Injection and Enhanced Solar Wind Pressure in the Earth’s Magnetosphere: Two different EMIC wave Sources

doi:10.1029/2020GL090275

Substorm injection and solar wind dynamic pressure have long been considered as two main drivers of EMIC wave excitation, but clear observational evidence is still lacking. With Van Allen Probes data from 2012‐2017, we have investigated the roles of the two EMIC wave drivers separately, by using time‐modified AE⁺ and $urn:x-wiley:00948276:media:grl61382:grl61382-math-0001$ . Both the occurrence rate and magnetic amplitude of waves significantly increase with the enhancement of each index. During large AE⁺, EMIC waves are mainly generated in the dusk sector (16≤MLT≤20) and near the magnetic equator (|MLAT| < 10°). This is presumably due to substorm injected protons drifting from midnight sector to the plasmaspheric bulge. While, during large $urn:x-wiley:00948276:media:grl61382:grl61382-math-0002$ , EMIC waves mainly occur in the noon sector (9≤MLT≤15). But there exist higher‐latitude (10° < |MLAT| < 20°) source regions besides equatorial source, possibly due to the minimum B regions. Our results provide strong observational support to existing generation mechanisms of EMIC waves in the Earth's magnetosphere.

DOI	10.1029/2020GL090275
	Statistical Evidence for EMIC wave Excitation Driven by Substorm Injection and Enhanced Solar Wind Pressure in the Earth’s Magnetosphere: Two different EMIC wave Sources
	Huayue Chen; Xinliang Gao; Quanming Lu; Bruce T. Tsurutani; Shui Wang
	2020-10-17
发表期刊	Geophysical Research Letters
出版年	2020
英文摘要	Substorm injection and solar wind dynamic pressure have long been considered as two main drivers of EMIC wave excitation, but clear observational evidence is still lacking. With Van Allen Probes data from 2012‐2017, we have investigated the roles of the two EMIC wave drivers separately, by using time‐modified AE⁺ and $urn:x-wiley:00948276:media:grl61382:grl61382-math-0001$ . Both the occurrence rate and magnetic amplitude of waves significantly increase with the enhancement of each index. During large AE⁺, EMIC waves are mainly generated in the dusk sector (16≤MLT≤20) and near the magnetic equator (\|MLAT\| < 10°). This is presumably due to substorm injected protons drifting from midnight sector to the plasmaspheric bulge. While, during large $urn:x-wiley:00948276:media:grl61382:grl61382-math-0002$ , EMIC waves mainly occur in the noon sector (9≤MLT≤15). But there exist higher‐latitude (10° < \|MLAT\| < 20°) source regions besides equatorial source, possibly due to the minimum B regions. Our results provide strong observational support to existing generation mechanisms of EMIC waves in the Earth's magnetosphere.
领域	气候变化
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引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/299207
专题	气候变化
推荐引用方式 GB/T 7714	Huayue Chen,Xinliang Gao,Quanming Lu,等. Statistical Evidence for EMIC wave Excitation Driven by Substorm Injection and Enhanced Solar Wind Pressure in the Earth’s Magnetosphere: Two different EMIC wave Sources[J]. Geophysical Research Letters,2020.
APA	Huayue Chen,Xinliang Gao,Quanming Lu,Bruce T. Tsurutani,&Shui Wang.(2020).Statistical Evidence for EMIC wave Excitation Driven by Substorm Injection and Enhanced Solar Wind Pressure in the Earth’s Magnetosphere: Two different EMIC wave Sources.Geophysical Research Letters.
MLA	Huayue Chen,et al."Statistical Evidence for EMIC wave Excitation Driven by Substorm Injection and Enhanced Solar Wind Pressure in the Earth’s Magnetosphere: Two different EMIC wave Sources".Geophysical Research Letters (2020).

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