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SC-Associated Electric Field Variations in the Magnetosphere and Ionospheric Convective Flows

Cited 1 time in scopus
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Title
SC-Associated Electric Field Variations in the Magnetosphere and Ionospheric Convective Flows
Other Titles
자기권과 전리권 대류장에서의 자기권 급시 현상에 의한 전기장 변화 연구
Authors
Kim, S. -I.
J. R. Wygant
M. Lester
T. Hori
N. Nishimura
Jee, Geonhwa
Lee, Ensang
Jin, Ho
Kwan, Hyuckjin
Kim, Khan-Hyuk
Subject
Astronomy & Astrophysics
Keywords
Ionospheric convection flow is strongly connected with SC-associated E-field variation; SC-associated E-field signature changes with local time during SC interval; The E-field variation is associated with magnetospheric convection flow enhanced during SC interval
Issue Date
2017
Citation
Kim, S. -I., et al. 2017. "SC-Associated Electric Field Variations in the Magnetosphere and Ionospheric Convective Flows". JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 122(11): 11044-11057.
Abstract
We examine magnetic and electric field perturbations associated with a sudden commencement (SC), caused by and interplanetary (IP) shock passing over the Earth's magnetosphere on 16 February 2013. The SC was identified in the magnetic and elecric data measured at THEMIS-E, Van Allen Probe-A, and Van Allen Probe-B in the magnetosphere. During the SC interval, THE-E observed a dawnward-then-duskward electric (E) field perturbation atround noon, while VAP-B observed a duskward E-field perturbation atround midnight. VAP-A observed a dawnward-then-duskward E-field perturbation in the postmidnight sector, but the duration and magnitude of the dawnward E-perturbation are much shorter and waker than that of THE-E. That is, the E-field signature changes with local time during the SC interval. The SuperDARN radar indicate that the ionospheric plasma motions during the SC are mainly due to the E-field variations observed in space. This indicates that the SC-associated E-field in space plays a significant role in determining the dynamic variations of the ionospheric convection flow. By comparing previous SC MHD simulations and our observations, we suggest that the E-field variations observed at the spacecraft are produced by magnetospheric convection flows due to deformation of the magnetosphere as the IP shock sweeps the magnetopause.
URI
http://repository.kopri.re.kr/handle/201206/6107
DOI
http://dx.doi.org/10.1002/2017JA024611
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