DOI: 10.1002/2017JA024754
Scopus记录号: 2-s2.0-85042266650
论文题名: Comparison of Relativistic Microburst Activity Seen by SAMPEX With Ground-Based Wave Measurements at Halley, Antarctica
作者: Douma E. ; Rodger C.J. ; Clilverd M.A. ; Hendry A.T. ; Engebretson M.J. ; Lessard M.R.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 2 起始页码: 1279
结束页码: 1294
语种: 英语
英文关键词: chorus waves
; EMIC waves
; Halley
; relativistic microbursts
; SAMPEX
英文摘要: Relativistic electron microbursts are a known radiation belt particle precipitation phenomenon; however, experimental evidence of their drivers in space have just begun to be observed. Recent modeling efforts have shown that two different wave modes (whistler mode chorus waves and electromagnetic ion cyclotron (EMIC) waves) are capable of causing relativistic microbursts. We use the very low frequency/extremely low frequency Logger Experiment and search coil magnetometer at Halley, Antarctica, to investigate the ground-based wave activity at the time of the relativistic microbursts observed by the Solar Anomalous Magnetospheric Particle Explorer. We present three case studies of relativistic microburst events, which have one or both of the wave modes present in ground-based observations at Halley. To extend and solidify our case study results, we conduct superposed epoch analyses of the wave activity present at the time of the relativistic microburst events. Increased very low frequency wave amplitude is present at the time of the relativistic microburst events, identified as whistler mode chorus wave activity. However, there is also an increase in Pc1–Pc2 wave power at the time of the relativistic microburst events, but it is identified as broadband noise and not structured EMIC emissions. We conclude that whistler mode chorus waves are, most likely, the primary drivers of relativistic microbursts. However, case studies confirm the potential of EMIC waves as an occasional driver of relativistic microbursts. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114519
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Physics, University of Otago, Dunedin, New Zealand; British Antarctic Survey, NERC, Cambridge, United Kingdom; Department of Physics, Augsburg University, Minneapolis, MN, United States; Department of Physics, University of New Hampshire, Durham, NH, United States
Recommended Citation:
Douma E.,Rodger C.J.,Clilverd M.A.,et al. Comparison of Relativistic Microburst Activity Seen by SAMPEX With Ground-Based Wave Measurements at Halley, Antarctica[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(2)