DOI: 10.1002/2015GL067373
论文题名: Propagation properties of quasiperiodic VLF emissions observed by the DEMETER spacecraft
作者: Hayosh M. ; Němec F. ; Santolík O. ; Parrot M.
刊名: Geophysical Research Letters
ISSN: 0094-9392
EISSN: 1944-9123
出版年: 2016
卷: 43, 期: 3 起始页码: 1007
结束页码: 1014
语种: 英语
英文关键词: DEMETER spacecraft
; quasiperiodic emissions
; wave propagation in ionosphere
Scopus关键词: Electromagnetic waves
; Geomagnetism
; Ionosphere
; Ionospheric measurement
; Magnetosphere
; Modulation
; Wave propagation
; Demeter
; Equatorial regions
; Geomagnetic equator
; Inner magnetosphere
; Modulation period
; Propagation pattern
; Propagation properties
; Quasi-periodic
; Spacecraft
; DEMETER
; electromagnetic wave
; geomagnetism
; ionosphere
; magnetic field
; magnetosphere
; spacecraft
; wave propagation
英文摘要: Quasiperiodic (QP) emissions are electromagnetic waves in the frequency range of about 0.5-4 kHz observed in the inner magnetosphere that exhibit a periodic time modulation of the wave intensity, with modulation periods from a few seconds up to 10 min. We present results of a detailed wave analysis of nearly 200 events measured by the low-altitude Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) spacecraft. Upper frequency range of studied emissions was limited to 1 kHz due to the sampling rate of the analyzed data. It is found that QP emissions propagate nearly field aligned at larger geomagnetic latitudes; they become more oblique at midlatitudes and eventually perpendicular to the ambient magnetic field at the geomagnetic equator and thus perpendicular to the Earth's surface, allowing their downward propagation through the ionosphere. The observed propagation pattern is consistent with the source of emissions located in the equatorial region at larger radial distances. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84959431828&doi=10.1002%2f2015GL067373&partnerID=40&md5=6a3662aac01975fc066b6cdd9ae89568
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10355
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: Department of Space Physics, Institute of Atmospheric Physics, CAS, Prague, Czech Republic
Recommended Citation:
Hayosh M.,Němec F.,Santolík O.,et al. Propagation properties of quasiperiodic VLF emissions observed by the DEMETER spacecraft[J]. Geophysical Research Letters,2016-01-01,43(3).