DOI: 10.1002/2015GL064911
论文题名: Identification of the source of quasiperiodic VLF emissions using ground-based and Van Allen Probes satellite observations
作者: Titova E.E. ; Kozelov B.V. ; Demekhov A.G. ; Manninen J. ; Santolik O. ; Kletzing C.A. ; Reeves G.
刊名: Geophysical Research Letters
ISSN: 0094-8592
EISSN: 1944-8323
出版年: 2015
卷: 42, 期: 15 起始页码: 6137
结束页码: 6145
语种: 英语
英文关键词: energetic electrons
; quasiperiodic emissions
; Van Allen Probes
; VLF waves
Scopus关键词: Atmospherics
; Distribution functions
; Electron scattering
; Electrons
; Geomagnetism
; Magnetic fields
; Magnetosphere
; Probes
; Satellite ground stations
; Spacecraft
; Electric and magnetic fields
; Electron distribution function
; Energetic electron
; Ground-based observations
; Pitch angle distribution
; Quasi-periodic
; Satellite observations
; Wave-particle interactions
; Electron emission
; emission
; ground-based measurement
; isotropy
; magnetosphere
; satellite imagery
; spacecraft
; Finland
英文摘要: We report on simultaneous spacecraft and ground-based observations of quasiperiodic VLF emissions and related energetic-electron dynamics. Quasiperiodic emissions in the frequency range 2-6 kHz were observed during a substorm on 25 January 2013 by Van Allen Probe-A and a ground-based station in the Northern Finland. The spacecraft detected the VLF signals near the geomagnetic equator in the night sector at L = 3.0-4.2 when it was inside the plasmasphere. During the satellite motion toward higher latitudes, the time interval between quasiperiodic elements decreased from 6 min to 3 min. We find one-to-one correspondence between the quasiperiodic elements detected by Van Allen Probe-A and on the ground, which indicates the temporal nature of the observed variation in the time interval between quasiperiodic elements. MultiCyrillic small letter esomponent measurements of the wave electric and magnetic fields by the Van Allen Probe-A show that the quasiperiodic emissions were almost circularly right-hand polarized whistler mode waves and had predominantly small (below 30°) wave vector angles with respect to the magnetic field. In the probable source region of these signals (L about 4), we observed synchronous variations of electron distribution function at energies of 10-20 keV and the quasiperiodic elements. In the pause between the quasiperiodic elements pitch angle distribution of these electrons had a maximum near 90°, while they become more isotropic during the development of quasiperiodic elements. The parallel energies of the electrons for which the data suggest direct evidence of the wave-particle interactions is in a reasonable agreement with the estimated cyclotron resonance energy for the observed waves. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940449636&doi=10.1002%2f2015GL064911&partnerID=40&md5=25113d1755db75cb7f37e0fdfa08ee03
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8208
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: Polar Geophysical Institute, Kola Science Center, RAS, Apatity, Russian Federation
Recommended Citation:
Titova E.E.,Kozelov B.V.,Demekhov A.G.,et al. Identification of the source of quasiperiodic VLF emissions using ground-based and Van Allen Probes satellite observations[J]. Geophysical Research Letters,2015-01-01,42(15).