globalchange  > 气候减缓与适应
DOI: 10.1029/2018JA025482
Scopus记录号: 2-s2.0-85050267263
论文题名:
Equatorial Noise With Quasiperiodic Modulation: Multipoint Observations by the Van Allen Probes Spacecraft
作者: Němec F.; Santolík O.; Boardsen S.A.; Hospodarsky G.B.; Kurth W.S.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:6
起始页码: 4809
结束页码: 4819
语种: 英语
英文关键词: equatorial noise ; quasiperiodic modulation ; RBSP ; Van Allen Probes
英文摘要: Electromagnetic wave measurements performed by the two Van Allen Probes spacecraft are used to analyze equatorial noise emissions with a quasiperiodic modulation of the wave intensity. These waves are confined to the vicinity of the geomagnetic equator, and they occur primarily on the dayside. In situ plasma number density measurements are used to evaluate density variations related to the wave occurrence. It is shown that the events are sometimes effectively confined to low-density regions, being observed at successive satellite passes over a time duration as long as 1 hr. The events typically occur outside the plasmasphere, and they often cease to exist just at the plasmapause. The analysis of the spatial separations of the spacecraft at the times when the events were observed simultaneously by both of them allows us to estimate the event spatial dimensions. It is found that the event spatial extent is typically lower than about 0.25RE in radial distance and within about 1 hr in magnetic local time. Modulation periods of the events decrease with increasing plasma number density up to about 100 cm−3. Principally no dependence is observed at larger densities, possibly indicating a propagation from other locations. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113822
Appears in Collections:气候减缓与适应

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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; Goddard Planetary Heliophysics Institute, University of Maryland, Baltimore County, MD, United States; NASA/GSFC, Greenbelt, MD, United States; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States

Recommended Citation:
Němec F.,Santolík O.,Boardsen S.A.,et al. Equatorial Noise With Quasiperiodic Modulation: Multipoint Observations by the Van Allen Probes Spacecraft[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(6)
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