DOI: 10.1029/2018JA025382
Scopus记录号: 2-s2.0-85050690220
论文题名: Detailed Properties of Equatorial Noise With Quasiperiodic Modulation
作者: Němec F. ; Santolík O. ; Hayosh M. ; Darrouzet F. ; Cornilleau-Wehrlin N.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 7 起始页码: 5344
结束页码: 5355
语种: 英语
英文关键词: Cluster spacecraft
; equatorial noise
; fast magnetosonic waves
; quasiperiodic modulation
英文摘要: Equatorial noise (EN) emissions are electromagnetic waves observed routinely in the equatorial region of the inner magnetosphere. Although they are typically continuous in time, they sometimes exhibit a quasiperiodic (QP) time modulation of the wave intensity, with modulation periods on the order of minutes. We perform a detailed analysis of 118 EN events with the QP modulation. The events are observed preferentially outside the plasmasphere. We determine the times and frequencies of individual QP elements forming the events. Apart from the event modulation period, this allows us to characterize the intensity and the frequency drift of individual QP wave elements. It is shown that the element intensity peaks at the magnetic equator. The modulation period within a single event is usually quite stable, with variations lower than 25% of the median value in the vast majority of cases. The events with shorter modulation periods are typically more intense, and they tend to have larger frequency drifts. These relations resemble the relations formerly revealed for extra low frequency/very low frequency quasiperiodic emissions, suggesting that the origin of the QP modulation of the wave intensity of EN and ELF/VLF emissions might be similar. ©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/113640
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic; Department of Space Physics, Institute of Atmospheric Physics, The Czech Academy of Sciences, Prague, Czech Republic; Royal Belgian Institute for Space Aeronomy, Brussels, Belgium; Laboratoire de Physique des Plasmas, Ecole Polytechnique, CNRS, Palaiseau, France; LESIA, Observatoire de Meudon, Meudon, France
Recommended Citation:
Němec F.,Santolík O.,Hayosh M.,et al. Detailed Properties of Equatorial Noise With Quasiperiodic Modulation[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(7)