| 项目编号: | 1216373
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| 项目名称: | Magnetosphere - Ionosphere Coupling During Periods of Extreme Solar Wind Driving |
| 作者: | Calvin Robert Clauer
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| 承担单位: | Virginia Polytechnic Institute and State University
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| 批准年: | 2013
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| 开始日期: | 2014-09-01
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| 结束日期: | 2017-08-31
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| 资助金额: | USD301668
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| 资助来源: | US-NSF
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| 项目类别: | Continuing grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Atmospheric and Geospace Sciences
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| 英文关键词: | solar wind
; magnetosphere
; ionosphere
; ionosphere system
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| 英文摘要: | The dynamics of the solar wind, magnetosphere and ionosphere system are driven by the solar wind electric field. Under normal solar wind conditions the cross polar cap potential (CPCP) difference scales with the solar wind electric field. However under extreme solar wind conditions such as those occurring during magnetic storms the CPCP becomes non-linear and saturates. This study will primarily support a post-doctoral scholar at Virginia Polytechnic and State University who will be taught about the operation of both coherent and incoherent scatter ionospheric radars.
The goals of this study are to investigate the causes of the saturation and to understand why the northern and southern hemispheres behave differently. There have been two classes of explanations for CPCP saturation. In one dayside region 1 field aligned currents limit the magnetic reconnection rate for strong driving and in the other an Alfvén wing is set up in which a portion of the electric field set up by the solar wind is reflected at the ionosphere as the result of a conductance mismatch between the Alfvénic conductance of the solar wind and the Pedersen conductance of the ionosphere. The team proposes a third explanation that ionospheric plasma instabilities lead to limitations on ionospheric currents and that this feeds back into the magnetosphere. The research involves using a hybrid simulation code and observations from SuperDARN and ISR radar in the ionosphere, ACE solar wind observations and THEMIS data in the magnetosphere. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/95824
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Calvin Robert Clauer. Magnetosphere - Ionosphere Coupling During Periods of Extreme Solar Wind Driving. 2013-01-01.
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