GSTDTAP  > 气候变化
DOI10.1002/2017GL072817
Magnetospheric balance of solar wind dynamic pressure
Lopez, Ramon E.1; Gonzalez, Walter D.2
2017-04-16
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2017
卷号44期号:7
文章类型Article
语种英语
国家USA; Brazil
英文摘要

The magnetopause is the boundary established by pressure balance between the solar wind flow in the magnetosheath and the magnetosphere. Generally, this pressure balance is represented to be between the solar wind, the dynamic pressure, and the magnetic pressure of Earth's dipole field. The plasma actually in contact with the magnetosphere is the slowed, compressed, and heated solar wind downstream of the shock. The force exerted on the magnetosheath plasma is the JxB force produced by the Chapman-Ferraro current that flows on the magnetopause. Under typical solar wind conditions of relatively high magnetosonic Mach number flow (>6), this simple picture is a reasonable description of the situation. However, under conditions of low solar wind magnetosonic Mach number flow (similar to 2) the force on the solar wind plasma is not exerted at the magnetopause and must be exerted at the bow shock by currents that connect to the Region 1 currents. In this paper we present observations from two magnetopause crossings observed by the Time History of Events and Macroscale Interactions during Substorms spacecraft to compare and contrast the force balance with the solar wind for two situations with very different solar wind magnetosonic Mach numbers.


Plain Language Summary When the solar wind hits Earth's magnetic field, the magnetic field pushes back on the solar wind. Typically, this force is exerted at the boundary between Earth's magnetic field and the solar wind. However, when the supersonic solar wind has a low Mach number (about 2, as opposed to the typical value of >6), the place where the force is exerted on the solar wind is at the bow shock wave in front of Earth. This force is produced by an electric current that flows on the bow shock and which connects to currents that flow directly into Earth's ionosphere in the polar regions. This paper presents spacecraft observations documenting this unusual situation.


英文关键词magnetopause bow shock currents
领域气候变化
收录类别SCI-E
WOS记录号WOS:000400186500004
WOS关键词TRANSPOLAR POTENTIAL SATURATION ; REGION-1 CURRENT SYSTEM ; MAGNETOPAUSE
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/27893
专题气候变化
作者单位1.Univ Texas Arlington, Dept Phys, POB 19059, Arlington, TX 76019 USA;
2.Natl Inst Space Res, Sao Jose Dos Campos, Brazil
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GB/T 7714
Lopez, Ramon E.,Gonzalez, Walter D.. Magnetospheric balance of solar wind dynamic pressure[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(7).
APA Lopez, Ramon E.,&Gonzalez, Walter D..(2017).Magnetospheric balance of solar wind dynamic pressure.GEOPHYSICAL RESEARCH LETTERS,44(7).
MLA Lopez, Ramon E.,et al."Magnetospheric balance of solar wind dynamic pressure".GEOPHYSICAL RESEARCH LETTERS 44.7(2017).
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