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DOI | 10.1002/2017GL075020 |
What Happens Before a Southward IMF Turning Reaches the Magnetopause? | |
Samsonov, A. A.1; Sibeck, D. G.2; Dmitrieva, N. P.1; Semenov, V. S.1 | |
2017-09-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:18 |
文章类型 | Article |
语种 | 英语 |
国家 | Russia; USA |
英文摘要 | Previous observations have shown a similar to 10-15min time delay in the ionospheric response to solar wind directional discontinuities marked by either southward or northward interplanetary magnetic field (IMF) turnings. We have studied one southward IMF turning observed by Time History of Events and Macroscale Interactions during Substorms (THEMIS) and GOES in the dayside magnetosphere. Using a global MHD model, we have reproduced the magnetopause motion in this event. We find that the observed delay in the ground response can be completely explained by deceleration of the directional discontinuity in the subsolar magnetosheath. We show that the speed of the discontinuity significantly decreases in the vicinity of the magnetopause where the magnetic barrier formed during the previous northward IMF interval. The southward turning can reach the magnetopause only after complete disruption of the magnetic barrier. The disruption or dissipation occurs via magnetosheath reconnection, as confirmed by high-speed jets in the magnetosheath. The magnetopause moves sunward as the directional discontinuity transits the magnetosheath. This sunward motion is followed by the earthward motion when the discontinuity strikes the magnetopause and magnetopause reconnection begins. |
英文关键词 | southward IMF turning magnetosheath reconnection |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413148100006 |
WOS关键词 | INTERPLANETARY MAGNETIC-FIELD ; IONOSPHERIC CONVECTION RESPONSE ; BOW SHOCK ; ELECTRIC-FIELD ; MHD SIMULATION ; MAGNETOSPHERE ; MAGNETOSHEATH ; DEPENDENCE ; COMPONENT ; DIRECTION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27979 |
专题 | 气候变化 |
作者单位 | 1.St Petersburg State Univ, Earths Phys Dept, St Petersburg, Russia; 2.NASA, Goddard Space Flight Ctr, Code 674, Greenbelt, MD USA |
推荐引用方式 GB/T 7714 | Samsonov, A. A.,Sibeck, D. G.,Dmitrieva, N. P.,et al. What Happens Before a Southward IMF Turning Reaches the Magnetopause?[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(18). |
APA | Samsonov, A. A.,Sibeck, D. G.,Dmitrieva, N. P.,&Semenov, V. S..(2017).What Happens Before a Southward IMF Turning Reaches the Magnetopause?.GEOPHYSICAL RESEARCH LETTERS,44(18). |
MLA | Samsonov, A. A.,et al."What Happens Before a Southward IMF Turning Reaches the Magnetopause?".GEOPHYSICAL RESEARCH LETTERS 44.18(2017). |
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