Mathematical Sciences: Group Theory and Buildings

一项为期5年的计划是利用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。对日侧磁层磁场强度的线性预测滤波分析将确定与IMF南北分量、IMF锥角和太阳风动压变化响应相关的时间尺度和滞后。对地球同步磁场观测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。我们将利用获得的结果来区分太阳风-磁层相互作用的几种建议模式，并将日面磁层顶模型扩展到太阳风参数的更极端值。我们提出了一个计划，利用磁层磁场的东西分量的变化来区分日面合并的分量和反平行模式，作为太阳风条件的函数。最后，我们结合太阳风、地球同步观测和地面观测，研究了南北IMF转向和太阳风动压变化对低纬度日侧地面磁图的影响，以确定DP2对流模式变化期间低纬度地面磁图中H分量增强的原因。

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.