DOI: 10.1029/2017JA025174
Scopus记录号: 2-s2.0-85048884142
论文题名: Magnetosheath Propagation Time of Solar Wind Directional Discontinuities
作者: Samsonov A.A. ; Sibeck D.G. ; Dmitrieva N.P. ; Semenov V.S. ; Slivka K.Y. ; Šafránkova J. ; Němeček Z.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 5 起始页码: 3727
结束页码: 3741
语种: 英语
英文关键词: directional discontinuity
; magnetosheath reconnection
; solar wind time lag
; southward turning
英文摘要: Observed delays in the ground response to solar wind directional discontinuities have been explained as the result of larger than expected magnetosheath propagation times. Recently, Samsonov et al. (2017, https://doi.org/10.1002/2017GL075020) showed that the typical time for a southward interplanetary magnetic field (IMF) turning to propagate across the magnetosheath is 14 min. Here by using a combination of magnetohydrodynamic simulations, spacecraft observations, and analytic calculations, we study the dependence of the propagation time on solar wind parameters and near-magnetopause cutoff speed. Increases in the solar wind speed result in greater magnetosheath plasma flow velocities, decreases in the magnetosheath thickness and, as a result, decreases in the propagation time. Increases in the IMF strength result in increases in the magnetosheath thickness and increases in the propagation time. Both magnetohydrodynamic simulations and observations suggest that propagation times are slightly smaller for northward IMF turnings. Magnetosheath flow deceleration must be taken into account when predicting the arrival times of solar wind structures at the dayside magnetopause. ©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/114013
Appears in Collections: 气候减缓与适应
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作者单位: St. Petersburg State UniversitySt. Petersburg, Russian Federation; Mullard Space Science Laboratory, University College London, Holmbury St Mary, United Kingdom; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
Recommended Citation:
Samsonov A.A.,Sibeck D.G.,Dmitrieva N.P.,et al. Magnetosheath Propagation Time of Solar Wind Directional Discontinuities[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)