Comprehensive study of the magnetospheric response to a hot flow anomaly

摘要: We present a comprehensive observational study of the magnetospheric response to an interplanetary magnetic field (IMF) tangential discontinuity, which first struck postnoon bow shock and magnetopause then swept past prenoon on July 24, 1996. Although unaccompanied by any significant plasma variation, discontinuity interacted with form hot flow anomaly (HFA), was observed Interball-1 just upstream from shock. Pressures within Earthward HFA were depressed order magnitude, allowed briefly (∼7 min) move outward some 5 RE beyond its nominal position engulf Interball-1. A timing employing nearby Magion-4 observations demonstrates that this motion corresponded antisunward northward moving wave magnetopause. The same engulfed Geotail, nominally located downstream in outer dawn magnetosheath. Despite large amplitude, produced only minor effects GOES-8 geosynchronous near local dawn. Polar Ultraviolet Imager (UVI) sudden brightening afternoon aurora, followed even more intense transient morning aurora. Consistent asymmetry, weak near-simultaneous perturbations high-latitude ground magnetometers but convection vortex Greenland magnetograms. results indicate solar wind interaction is far dynamic than previously imagined wind-magnetosphere interaction.