DOI: 10.1002/2014GL059533
论文题名: Simulations of inner magnetosphere dynamics with an expanded RAM-SCB model and comparisons with Van Allen Probes observations
作者: Jordanova V.K. ; Yu Y. ; Niehof J.T. ; Skoug R.M. ; Reeves G.D. ; Kletzing C.A. ; Fennell J.F. ; Spence H.E.
刊名: Geophysical Research Letters
ISSN: 0094-10140
EISSN: 1944-9871
出版年: 2014
卷: 41, 期: 8 起始页码: 2687
结束页码: 2694
语种: 英语
英文关键词: inner magnetosphere
; radiation belts
; ring current
Scopus关键词: Ions
; Magnetic fields
; Probes
; Radiation belts
; Storms
; Trapped ions
; Electric and magnetic fields
; Energetic particles
; Geosynchronous orbits
; Inner magnetosphere
; Interactions modeling
; Ion cyclotron instability
; Magnetic electrons
; Ring currents
; Computer simulation
; atmospheric modeling
; geoelectric field
; geomagnetic storm
; ion exchange
; magnetic field
; magnetosphere
; magnetotail
; plasma
; probe
英文摘要: Simulations from our newly expanded ring current-atmosphere interactions model with self-consistent magnetic field (RAM-SCB), now valid out to 9 R E, are compared for the first time with Van Allen Probes observations. The expanded model reproduces the storm time ring current buildup due to the increased convection and inflow of plasma from the magnetotail. It matches Magnetic Electron Ion Spectrometer (MagEIS) observations of the trapped high-energy (>50 keV) ion flux; however, it underestimates the low-energy (<10 keV) Helium, Oxygen, Proton, and Electron (HOPE) observations. The dispersed injections of ring current ions observed with the Energetic particle, Composition, and Thermal plasma (ECT) suite at high (>20 keV) energy are better reproduced using a high-resolution convection model. In agreement with Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) observations, RAM-SCB indicates that the large-scale magnetic field is depressed as close as ∼4.5 RE during even a moderate storm. Regions of electromagnetic ion cyclotron instability are predicted on the duskside from ∼6 to ∼9 RE, indicating that previous studies confined to geosynchronous orbit may have underestimated their scattering effect on the energetic particles. Key Points Expanded RAM-SCB model reproduces well high-energy (>50 keV) MagEIS observations The magnetic field is depressed as close as ∼4.5 RE during even a moderate storm EMIC wave growth extends on duskside from ∼6 to ∼9 RE during storm main phase ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84899038567&doi=10.1002%2f2014GL059533&partnerID=40&md5=be6408974851f2f5beb8f678e80a6540
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7404
Appears in Collections: 气候减缓与适应
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作者单位: Space Science and Applications, Los Alamos National Laboratory, Los Alamos, NM, United States
Recommended Citation:
Jordanova V.K.,Yu Y.,Niehof J.T.,et al. Simulations of inner magnetosphere dynamics with an expanded RAM-SCB model and comparisons with Van Allen Probes observations[J]. Geophysical Research Letters,2014-01-01,41(8).