DOI: 10.1002/2016GL071566
论文题名: Van Allen Probes observations of cross-scale coupling between electromagnetic ion cyclotron waves and higher-frequency wave modes
作者: Colpitts C.A. ; Cattell C.A. ; Engebretson M. ; Broughton M. ; Tian S. ; Wygant J. ; Breneman A. ; Thaller S.
刊名: Geophysical Research Letters
ISSN: 0094-8396
EISSN: 1944-8127
出版年: 2016
卷: 43, 期: 22 起始页码: 11510
结束页码: 11518
语种: 英语
英文关键词: EMIC
; modulation
; precipitation
; radiation belt
; wave
; whistler
Scopus关键词: Acoustic wave reflection
; Cyclotron radiation
; Cyclotrons
; Electric fields
; Electron beams
; Modulation
; Precipitation (chemical)
; Probes
; Radiation belts
; Waves
; EMIC
; High frequency waves
; Higher frequencies
; Ion cyclotron waves
; Lower frequencies
; Magnetosonic waves
; Pitch-angle scattering
; Whistler
; Atmospherics
英文摘要: We present observations of higher-frequency (~50–2500 Hz, ~0.1–0.7 fce) wave modes modulated at the frequency of colocated lower frequency (0.5–2 Hz, on the order of fci) waves. These observations come from the Van Allen Probes Electric Field and Waves instrument's burst mode data and represent the first observations of coupling between waves in these frequency ranges. The higher-frequency wave modes, typically whistler mode hiss and chorus or magnetosonic waves, last for a few to a few tens of seconds but are in some cases observed repeatedly over several hours. The higher-frequency waves are observed to be unmodulated before and after the presence of the electromagnetic ion cyclotron (EMIC) waves, but when the EMIC waves are present, the amplitude of the higher-frequency waves drops to the instrument noise level once every EMIC wave cycle. Such modulation could significantly impact wave-particle interactions such as acceleration and pitch angle scattering, which are crucial in the formation and depletion of the radiation belts. We present one case study with broadband, high-frequency waves observed to be modulated by EMIC waves repeatedly over a 2 h time span on both spacecraft. Finally, we show two additional case studies where other high-frequency wave modes exhibit similar modulation. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85003023099&doi=10.1002%2f2016GL071566&partnerID=40&md5=bdc638df51de2a38383223566fb74c69
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9359
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: School of Physics and Astronomy, University of Minnesota, Twin Cities, Minneapolis, MN, United States
Recommended Citation:
Colpitts C.A.,Cattell C.A.,Engebretson M.,et al. Van Allen Probes observations of cross-scale coupling between electromagnetic ion cyclotron waves and higher-frequency wave modes[J]. Geophysical Research Letters,2016-01-01,43(22).