DOI: 10.1002/2017JA024593
Scopus记录号: 2-s2.0-85045224173
论文题名: Statistical Properties of Plasmaspheric Hiss From Van Allen Probes Observations
作者: Hartley D.P. ; Kletzing C.A. ; Santolík O. ; Chen L. ; Horne R.B.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 4 起始页码: 2605
结束页码: 2619
语种: 英语
英文关键词: bimodal
; chorus waves
; EMFISIS
; plasmaspheric hiss
; Van Allen Probes
; wave normal angle
英文摘要: Van Allen Probes observations are used to statistically investigate plasmaspheric hiss wave properties. This analysis shows that the wave normal direction of plasmaspheric hiss is predominantly field aligned at larger L shells, with a bimodal distribution, consisting of a near-field aligned and a highly oblique component, becoming apparent at lower L shells. Investigation of this oblique population reveals that it is most prevalent at L < 3, frequencies with f/fce>0.01 (or f > 700 Hz), low geomagnetic activity levels, and between 1900 and 0900 magnetic local time. This structure is similar to that reported for oblique chorus waves in the equatorial region, perhaps suggesting a causal link between the two wave modes. Ray tracing results from HOTRAY confirm that it is feasible for these oblique chorus waves to be a source of the observed oblique plasmaspheric hiss population. The decrease in oblique plasmaspheric hiss occurrence rates during more elevated geomagnetic activity levels may be attributed to the increase in Landau resonant electrons causing oblique chorus waves to be more substantially damped outside of the plasmasphere. In turn, this restricts the amount of wave power that can access the plasmasphere and evolve into oblique plasmaspheric hiss. These results confirm that, despite the difference in location of this bimodal distribution compared to previous studies, a direct link between oblique equatorial chorus outside of the plasmasphere and oblique hiss at low L shells is plausible. As such, these results are in keeping with the existing theory of chorus as the source of plasmaspheric hiss. ©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/114233
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States; Department of Space Physics, Institute of Atmospheric Physics, Prague, Czech Republic; Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic; Department of Physics, University of Texas at Dallas, Richardson, TX, United States; British Antarctic Survey, Cambridge, United Kingdom
Recommended Citation:
Hartley D.P.,Kletzing C.A.,Santolík O.,et al. Statistical Properties of Plasmaspheric Hiss From Van Allen Probes Observations[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(4)