A Geosynchronous Perspective on Solar Wind-Magnetosphere Interaction

太阳风-磁层相互作用的地球同步视角

基本信息

批准号：
9510303
负责人：
David Sibeck
金额：
$ 23.09万
依托单位：
Johns Hopkins University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1995
资助国家：
美国
起止时间：
1995-08-01 至 1998-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9510303&HistoricalAwards=false
关键词：
Geosynchronous Perspective Solar Wind Magnetosphere

项目摘要

A 5-year program is outlined to use GOES-5, -6, and -7 geosynchronous magnetic field observations to determine the characteristics of the solar wind-magnetosphere interaction. A linear prediction filter analysis of the dayside magnetospheric magnetic field strength will determine the time scales and lags associated with the response to variations in the north-south component of the IMF, the IMF cone angle, and the solar wind dynamic pressure. A Fourier decomposition of the geosynchronous magnetic field observations will determine the effects of these solar wind parameters upon the diurnal variation of the magnetospheric magnetic field. We will use the results so obtained to discriminate between several suggested modes for solar wind- magnetosphere interaction and to extend models for the dayside magnetopause to more extreme values of solar wind parameters. We propose a plan to use variations in the east-west component of the magnetospheric magnetic field to distinguish between component and antiparallel modes of dayside merging as a function of solar wind conditions. Finally, we combine solar wind, geosynchronous, and ground observations to study the effects of north/south IMF turnings and solar wind dynamic pressure variations upon low- latitude dayside ground magnetograms in an effort to determine the cause of the enhanced H components seen in low-latitude ground magnetograms during DP2 convection pattern variations.

一项为期 5 年的计划旨在利用 GOES-5、-6 和 -7 地球同步磁场观测来确定太阳风-磁层相互作用的特征。日侧磁层磁场强度的线性预测滤波器分析将确定与 IMF 南北分量、IMF 锥角和太阳风动态压力变化响应相关的时间尺度和滞后。地球同步磁场观测结果的傅里叶分解将确定这些太阳风参数对磁层磁场日变化的影响。我们将使用由此获得的结果来区分太阳风-磁层相互作用的几种建议模式，并将白天磁层顶的模型扩展到太阳风参数的更极端值。我们提出了一项计划，利用磁层磁场东西向分量的变化来区分日侧合并的分量模式和反平行模式作为太阳风条件的函数。最后，我们结合太阳风、地球同步和地面观测来研究北/南IMF转向和太阳风动压变化对低纬度白天地面磁图的影响，以确定低纬度地区H分量增强的原因。 -DP2 对流模式变化期间的纬度地面磁图。