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Distribution of equatorial Alfven velocity in the magnetosphere: a statistical analysis of THEMIS observations

Cited 2 time in wos
Cited 3 time in scopus
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Title
Distribution of equatorial Alfven velocity in the magnetosphere: a statistical analysis of THEMIS observations
Other Titles
THEMIS 위성 자료를 이용한 자기권 내부의 알펜 속도 분포 연구
Authors
Kim, Khan-Hyuk
Kim, Gi-Jeong
Kwan, Hyuckjin
Subject
Geology
Keywords
Dawn-dusk asymmetry in the equatorial Alfven velocity; Equatorail Alfven velocity; MHD waves; Plasmaspheric bulge
Issue Date
2018-11
Citation
Kim, Khan-Hyuk, et al. 2018. "Distribution of equatorial Alfven velocity in the magnetosphere: a statistical analysis of THEMIS observations". EARTH PLANETS AND SPACE, 70(174): 1-7.
Abstract
It has been known that the Alfven velocity plays a significant role in generation and propagation of magnetohydrodynamic (MHD) waves. Until now, however, the global distribution of the Alfven velocity in the magnetosphere has not been reported. To determine the spatial distribution of the Alfven velocity, we have statistically examined the THEMIS magnetic field and electron density data obtained in the L (the equatorial geocentric distance to the field line measured in Earth's radii) range of ~4-12 and at all local times near the magnetic equator between -5 deg and 5 deg in magnetic latitude (MLAT) for 2008-2014. We observed a pronounced dawn-dusk asymmetry in the equatorial Alfven velocity calculated from the THEMIS magnetic field and density data. That is, the dawnside Alfven velocity is higher than the duskside Alfven velocity. This asymmetry is due to the duskside bulge in the plasmasphere. The radial profile of the Alfven velocity shows an increasing function of L between L = 4 and 10 in the dusk sector, while a decreasing function in the dawn sector. By comparing these Alfven velocity distributions along the local time and radial distance, we discuss the occurrence distribution and propagation of MHD waves in the outer magnetosphere.
URI
https://repository.kopri.re.kr/handle/201206/10545
DOI
http://dx.doi.org/10.1186/s40623-018-0947-9
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