DOI: 10.1002/grl.50787
论文题名: An unusual enhancement of low-frequency plasmaspheric hiss in the outer plasmasphere associated with substorm-injected electrons
作者: Li W. ; Thorne R.M. ; Bortnik J. ; Reeves G.D. ; Kletzing C.A. ; Kurth W.S. ; Hospodarsky G.B. ; Spence H.E. ; Blake J.B. ; Fennell J.F. ; Claudepierre S.G. ; Wygant J.R. ; Thaller S.A.
刊名: Geophysical Research Letters
ISSN: 0094-8705
EISSN: 1944-8436
出版年: 2013
卷: 40, 期: 15 起始页码: 3798
结束页码: 3803
语种: 英语
英文关键词: chorus excitation
; hiss amplification
; substorm injection
Scopus关键词: Chorus waves
; Energetic electron
; Injected electrons
; Linear growth rate
; Low-frequency
; Resonant energy
; Substorm injections
; Wave frequencies
; Cutoff frequency
; Electromagnetic waves
; Electron scattering
; Probes
; Magnetosphere
; electron
; energetics
; frequency analysis
; magnetosphere
; optimization
; plasma
; resonance
; wave field
英文摘要: Both plasmaspheric hiss and chorus waves were observed simultaneously by the two Van Allen Probes in association with substorm-injected energetic electrons. Probe A, located inside the plasmasphere in the postdawn sector, observed intense plasmaspheric hiss, whereas Probe B observed chorus waves outside the plasmasphere just before dawn. Dispersed injections of energetic electrons were observed in the dayside outer plasmasphere associated with significant intensification of plasmaspheric hiss at frequencies down to ∼20 Hz, much lower than typical hiss wave frequencies of 100-2000 Hz. In the outer plasmasphere, the upper energy of injected electrons agrees well with the minimum cyclotron resonant energy calculated for the lower cutoff frequency of the observed hiss, and computed convective linear growth rates indicate instability at the observed low frequencies. This suggests that the unusual low-frequency plasmaspheric hiss is likely to be amplified in the outer plasmasphere due to the injected energetic electrons. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84881140670&doi=10.1002%2fgrl.50787&partnerID=40&md5=29ef2bba1d2e4cad71592b5a247d04f1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5969
Appears in Collections: 气候减缓与适应
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作者单位: Department of Atmospheric and Oceanic Sciences, UCLA, 7127 Math Sciences Bldg., 405 Hilgard Ave., Los Angeles, CA 90095, United States
Recommended Citation:
Li W.,Thorne R.M.,Bortnik J.,et al. An unusual enhancement of low-frequency plasmaspheric hiss in the outer plasmasphere associated with substorm-injected electrons[J]. Geophysical Research Letters,2013-01-01,40(15).