DOI: 10.1002/2016GL069582
论文题名: Propagation of equatorial noise to low altitudes: Decoupling from the magnetosonic mode
作者: Santolík O. ; Parrot M. ; Němec F.
刊名: Geophysical Research Letters
ISSN: 0094-8920
EISSN: 1944-8651
出版年: 2016
卷: 43, 期: 13 起始页码: 6694
结束页码: 6704
语种: 英语
英文关键词: equatorial noise
; magnetosonic waves
; polarization and propagation analysis
; ray tracing
Scopus关键词: Geomagnetism
; Ionizing radiation
; Radiation belts
; Ray tracing
; Electromagnetic emissions
; Electromagnetic measurement
; Equatorial noise
; Geomagnetic conditions
; Ion distributions
; Magnetosonic waves
; Propagation analysis
; Van allen radiation belts
; Ions
英文摘要: Equatorial noise (often phenomenologically described as magnetosonic waves in the literature) is a natural electromagnetic emission, which is generated by instability of ion distributions and which can interact with electrons in the Van Allen radiation belts. We use multicomponent electromagnetic measurements of the DEMETER spacecraft to investigate if equatorial noise propagates inward down to the Earth. Analysis of a selected event recorded under disturbed geomagnetic conditions shows that equatorial noise can be observed at an altitude of 700 km, while propagating radially downward as a superposition of spectral lines from different distant sources observed at frequencies both below and above the local proton cyclotron frequency. Changes in the local ion composition encountered by the waves during their inward propagation disconnect the identified wave mode from the low-frequency magnetosonic mode. The local ion composition also induces a cutoff which prevents the waves from propagating down to the ground. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978139103&doi=10.1002%2f2016GL069582&partnerID=40&md5=60de2cd023dab03ac607098bf53003dd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9883
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:
Santolík O.,Parrot M.,Němec F.. Propagation of equatorial noise to low altitudes: Decoupling from the magnetosonic mode[J]. Geophysical Research Letters,2016-01-01,43(13).