A Geosynchronous Perspective on Solar Wind-Magnetosphere Interaction

太阳风-磁层相互作用的地球同步视角

• 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

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.

概述了一个为期5年的计划，利用GOES-5，-6和-7地球同步磁场观测，以确定太阳风磁层相互作用的特征。 对昼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锥角和太阳风动压变化相关的时间尺度和滞后。 地球同步磁场观测的傅立叶分解将确定这些太阳风参数对磁层磁场日变化的影响。 我们将使用这样得到的结果来区分太阳风磁层相互作用的几个建议的模式，并扩展模型的向阳面磁层顶更极端的太阳风参数值。 我们提出了一个计划，利用磁层磁场的东西分量的变化，以区分组件和反平行模式的向阳面合并作为太阳风条件的函数。 最后，我们结合联合收割机太阳风、地球同步轨道和地面观测，研究了北/南IMF转向和太阳风动压变化对低纬昼侧地面磁图的影响，试图确定在DP 2对流型变化期间低纬地面磁图中H分量增强的原因。