DOI: 10.1002/2017JA024844
Scopus记录号: 2-s2.0-85045514075
论文题名: Comment on “Pulsating Auroras Produced by Interactions of Electrons and Time Domain Structures” by Mozer Et Al.
作者: Nishimura Y. ; Bortnik J. ; Li W. ; Angelopoulos V. ; Donovan E.F. ; Spanswick E.L.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 3 起始页码: 2064
结束页码: 2070
语种: 英语
英文关键词: magnetic field mapping
; pitch angle scattering
; pulsating aurora
; THEMIS
; Van Allen Probes (RBSP)
; wave particle interaction
英文摘要: Mozer et al. (2017, https://doi.org/10.1002/2017JA024223) suggested that time domain structures (TDSs) drive pulsating aurora (with additional contributions by kinetic Alfvén waves (KAWs)) and that chorus waves have negligible effects. In this comment, we point out that electrons scattered by TDS or KAW (dominantly at ~0.1–3 keV, <1 s modulation) cannot explain key features of pulsating aurora, which require precipitation above a few keV with a couple of tens of second modulation. Their study did not conduct quantitative evaluations of wave-aurora correlation. The use of short burst mode data (~<10 s) may only cover a single pulse of pulsating aurora and is not suitable for examining connections to pulsating aurora. “Field-aligned” electrons do not necessarily represent loss cone population, and their characteristic energy (hundreds of eV) is much lower than typical precipitation over pulsating aurora. By reexamining the events studied by Mozer et al., we quantitatively demonstrate that TDS and KAW are uncorrelated with pulsating aurora and that only chorus waves showed high correlations with pulsating aurora. Occasional simultaneous occurrence of TDS/KAW and pulsating aurora is found to be coincidental, because the correlation over a time scale of minutes is poor. Several auroral features analyzed in that paper are not pulsating aurora but other types of aurora. We also show that the chorus-pulsating aurora correlation can last for 2 h or longer and can be used to highlight dynamic changes in magnetic field mapping. Chorus waves can resonate with electrons above a few keV and are in agreement with pulsating auroral properties. ©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/114410
Appears in Collections: 气候减缓与适应
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作者单位: Department of Electrical and Computer Engineering and Center for Space Physics, Boston University, Boston, MA, United States; Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; Department of Astronomy and Center for Space Physics, Boston University, Boston, MA, United States; Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA, United States; Department of Physics and Astronomy, University of Calgary, Calgary, AB, Canada
Recommended Citation:
Nishimura Y.,Bortnik J.,Li W.,et al. Comment on “Pulsating Auroras Produced by Interactions of Electrons and Time Domain Structures” by Mozer Et Al.[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(3)