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작성일 : 14-05-19 13:46
5월 22일(목요일) 우주과학과 세미나 안내
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안녕하세요. 우주과학과 우주탐사학과 여러분.
 
세미나 공지 드리겠습니다.
 
 
이번 세미나는 5월 22일 오후 4시 30분 천문대 영상실에서 있습니다.
 
경희대의 권혁진 박사님 께서 " Plasmapause locations identified by THEMIS spacecraft under very quiet geomagnetic conditions (Kp ≤ 1) " 라는 제목의 강연을 해 주실 예정입니다.
 
강연은 한국어로 진행됩니다.
 
 
세미나 참석을 원하시는 분은 세미나 시작 10분 전까지 입실해 주시기 바랍니다.
 
많은 참석 부탁드립니다. 감사합니다.
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Dear Colleagues,
 
There will be an Astronomy and Space Science 22th, 4:30 PM,  in Auditorium, Kyung Hee Astronomical Observatory.
Dr. Hyuck-Jin. Kwon of KHU will give a presentation about " Plasmapause locations identified by THEMIS spacecraft under very quiet geomagnetic conditions (Kp ≤ 1) ".
 
The language of the seminar will be Korean.
 
 
You are asked to join the seminar five to ten minutes before it starts. Your attendance will greatly be appreciated.
 
 
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Seminar Information
 
When: May 22th (Thur), 4:30 PM
 
Where: Auditorium, Kyung Hee Astronomical Observatory.
 
Speaker: Dr. Hyuck-Jin. Kwon
 
Title : Plasmapause locations identified by THEMIS spacecraft under very quiet geomagnetic conditions (Kp ≤ 1)
Abstract:
In this study, we used cold electron density data observed by THEMIS probes to investigate the plasmapause location under quiet geomagnetic conditions (Kp≤1) from 2008 to 2009. The observation of THEMIS during two years provided good statistical coverage of all magnetic local times between and L shell of 3 to 13. We identified over 2000 plasmapause crossing events for all Kp and a total 1193 events were observed when Kp≤1. We assumed that plasmapause is not a layer, but it has thickness. Therefore, we separated plasmapause into two boundaries, inner and outer. We found that the outer boundary of plasmapause is observed near the geosynchronous orbit under extremely quiet geomagnetic conditions and this result is larger than model results. By contrast, inner boundary location is comparable with model results contrast to outer boundary. And bulge rotating profile on the observation coincides with the result of global core plasma model [{\it Gallagher et al.}, 2000]. We also examined the property of plasmapause between two boudnaries. As a result, the thickness of plasmapause is slightly difference between quiet and moderate geomagnetic conditions and electron density gradient increases as geomagnetic activity is enhanced except plasmasphere plume region. This results support that the property of plasmapause also depends on geomagnetic conditions.