Response of Day-Side Geomagnetic Field to the Northward Turning of IMF Bz

日侧地磁场对IMF Bz北转的响应

• 批准号: 0949193
• 负责人: Shinichi Ohtani
• 金额: $ 10万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-15 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0949193&HistoricalAwards=false
• 关键词: Response; Day; Side; Geomagnetic; Field

This project will examine the possibility of using ground-based magnetic field measurements near the magnetic equator to determine when a change in the interplanetary magnetic field (IMF) orientation hits Earth's magnetopause. Knowing exactly when an IMF polarity change hits the magnetopause is important for understanding the exact timing of events related to the initiation of a magnetic substorm. Currently there is no reliable way of knowing exactly when the polarity change encounters the magnetosphere because the only direct measurements are made by spacecraft located in the solar wind upstream from the magnetopause. Models for the propagation of the observed IMF from the spacecraft position to Earth are very inexact and potentially error prone.If the proposed method of using the equatorial electrojet can be demonstrated to be a robust method of determining the actual impact of the IMF on the magnetosphere the method has the potential to transform the way IMF controled phenomena are investigated. This would have significant impacts on our ability to specify space weather conditions.

该项目将研究使用磁赤道附近的地面磁场测量来确定行星际磁场(IMF)方向的变化何时击中地球磁层顶的可能性。准确地知道国际货币基金组织的极性变化何时到达磁层顶，对于了解与磁亚风暴的启动有关的事件的确切时间很重要。目前还没有可靠的方法来确切地知道磁极层何时发生变化，因为只有位于磁层顶上游的太阳风中的航天器才能进行直接测量。观测到的IMF从航天器位置传播到地球的模型非常不精确，而且有可能产生误差。如果所提出的使用赤道电喷流的方法能够被证明是确定IMF对磁层的实际影响的稳健方法，那么该方法有可能改变IMF控制现象的研究方式。这将对我们确定空间天气条件的能力产生重大影响。