Dayside Magnetospheric and Ionospheric Responses to a Foreshock Transient on 25 June 2008: 1. FLR Observed by Satellite and Ground‐Based Magnetometers

摘要: As one type of driver magnetospheric Alfven waves, foreshock transients have received less attention than, for example, the Kelvin-Helmholtz instability, discrete and broadband frequency solar wind dynamic pressure oscillations, interplanetary shocks. Previous works show that can induce both mode compressional Pc 3–5 ULF waves inside magnetosphere. However, to our knowledge, none these reported induced by transients, are proved be localized in In this paper, using situ ground-based observations, we report generation field line resonances (FLRs) a transient. Both transient 5 were found on duskside; while morning side magnetosphere, no clear wave signatures captured. Our results demonstrate addition global effects magnetosphere earlier, also generate responses range with dawn-dusk asymmetry. A suite eight dayside spacecraft plus ground magnetometer measurements make possible determination asymmetry response not previously such complete data set.