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Plasmapause location under quiet geomagnetic conditions (Kp≤1): THEMIS observations

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Title
Plasmapause location under quiet geomagnetic conditions (Kp≤1): THEMIS observations
Other Titles
THEMIS 위성관측 활용 플라즈마권 권계면의 위치 변화 연구
Authors
Kwon, H.-J.
Y. Nishimura
J.-S. Park
Jin, Ho
Jee, Geonhwa
Kim, Khan-Hyuk
Keywords
Location of auroral oval; Plasmapause location
Issue Date
2015
Citation
Kwon, H.-J., et al. 2015. "Plasmapause location under quiet geomagnetic conditions (Kp≤1): THEMIS observations". GEOPHYSICAL RESEARCH LETTERS, 42(18): 7303-7310.
Abstract
We statistically examined the plasmapause location (Lpp) under quiet geomagnetic conditions (Kp ≤ 1) using the electron density inferred from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft potential for 2 year period (2008 and 2009). Five hundred forty-three Lpp samples were identified under steady quiet conditions with Kp values ≤ 1 during 12 h prior to the plasmapause crossing. From our large data set, we determined the medians and means of Lpp in L and magnetic local time (MLT). They are located near geosynchronous orbit and nearly circular. The Lpp medians show a slight bulge located in postdusk sector. Comparing with previous models, our median or mean Lpp is extended ∼1?2 L from the Earth than the model Lpp along the local time from 0800 to 2400 MLT. That is, Lpp locations in the previous models are underestimated during quiet geomagnetic conditions.
URI
http://repository.kopri.re.kr/handle/201206/7395
DOI
http://dx.doi.org/10.1002/2015GL066090
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