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Observation of long-term disappearance and reappearance of the outer radiation belt
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  • Observation of long-term disappearance and reappearance of the outer radiation belt
  • Observation of long-term disappearance and reappearance of the outer radiation belt
저자명
이대영,신대규,김경찬,김진희,조정희,박미영,황정아,이용희,김경호,Lee. Dae-Young,Shin. Dae-Kyu,Kim. Kyung-Chan,Kim. Jin-Hee,Cho. Jung-Hee,Park. Mi Young,Angel
간행물명
천문학회보
권/호정보
2012년|37권 2호|pp.115-115 (1 pages)
발행정보
한국천문학회
파일정보
정기간행물|ENG|
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기타
이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

기타언어초록

In this study we have used the data of various instruments onboard the THEMIS spacecraft to study the characteristics of the outer radiation belt during the ascending phase of solar cycle 24. The most astonishing result is that we discovered four long-term (a month or so) periods during which the belt has nearly disappeared. The first disappearance started late 2008, followed by reappearance in ~a month, and three more similar events repeated until early 2010 when the belt has reappeared. This is well revealed at 719 keV electrons, which is the currently available uppermost energy channel from the THEMIS SST observation, but also seen at even lower energies. Overall consistent features were confirmed using the NOAA-POES observations. The vanished belt periods are associated with extremely weak solar wind conditions, low geomagnetic disturbances (in terms of Kp and AE/AL), greatly suppressed wave (ULF and chorus) activities, greatly reduced storm and substorm activities (little source particle supply), and expanded plasmapause locations. The direct observations of such events shed light on the fundamental question of the origin of the radiation belt, which is the main focus of our presentation.