DOI: 10.1002/2013GL058258
论文题名: Akebono observations of EMIC waves in the slot region of the radiation belts
作者: Sakaguchi K. ; Kasahara Y. ; Shoji M. ; Omura Y. ; Miyoshi Y. ; Nagatsuma T. ; Kumamoto A. ; Matsuoka A.
刊名: Geophysical Research Letters
ISSN: 0094-8410
EISSN: 1944-8141
出版年: 2013
卷: 40, 期: 21 起始页码: 5587
结束页码: 5591
语种: 英语
英文关键词: EMIC wave
; radiation belts
; slot region
; triggering emission
Scopus关键词: Akebono observations
; Electron radiation belt
; Inner magnetosphere
; Polarization analysis
; Relativistic electron
; Satellite trajectories
; slot region
; Wave polarizations
; Geomagnetism
; Radiation belts
; altitude
; electron
; magnetosphere
; observational method
; polarization
; precipitation (chemistry)
; satellite imagery
; wave propagation
英文摘要: This paper describes a unique observation of electromagnetic ion cyclotron (EMIC) waves in the deep inner magnetosphere at L = 2.5 - 5 made by the Akebono satellite at altitudes of 3,300 - 8,700 km. The mode conversion, i.e., L mode (He+ band) → R mode (He+ band) → L mode (O + band) was clearly identified from the equator to high latitudes. In addition, we found rising tone structures, recently identified as EMIC triggered emissions, which could lead to bursty precipitation of relativistic electrons. First, we estimated the ion composition ratio (H+, He +, O+) = (83%, 16%, 1%) from polarization analysis. Second, we estimated minimum resonant electron energies with the observed EMIC waves and triggered emissions to be ∼1-10 MeV. The satellite trajectory during the wave observation was primarily through the slot region of electron radiation belts. The collocation implies possible contribution of EMIC waves to formation of the slot region of radiation belts after a magnetic storm. Key Points Observations of EMIC waves in the slot region of radiation belts Ion composition ratio is estimated by wave polarization EMIC triggering emissions could lead to bursty precipitation of electrons ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84887348693&doi=10.1002%2f2013GL058258&partnerID=40&md5=de8bd297ee9789293b88e88e0a6d3089
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5674
Appears in Collections: 气候减缓与适应
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作者单位: National Institute of Information and Communications Technology, 4-2-1, Nukuikitamachi, Koganei, Tokyo 187-8795, Japan
Recommended Citation:
Sakaguchi K.,Kasahara Y.,Shoji M.,et al. Akebono observations of EMIC waves in the slot region of the radiation belts[J]. Geophysical Research Letters,2013-01-01,40(21).