POLAR-UVI and other Coordinated Observations of a Traveling Convection Vortex Event Observed on 24 July 1996

摘要: Coordinated analysis of data from the POLAR UVI instrument, ground magnetometers, incoherent scatter radar, solar wind monitors IMP-8 and WIND, DMSP satellite is focused on a traveling convection vortex (TCV) event 24 July 1966. Starting at 10:48 UT, magnetometers in Greenland eastern Canada measure pulsations consistent with passing overhead series alternating TCV field-aligned current pairs. Sondrestrom radar measures strong modulation strength direction ionospheric plasma flow, The magnetometer grow magnitude over next hour, peaking intensity 11:39 which time instrument localized intensification auroral emissions central western Greenland. Subsequent images show propagate westward (tailward) until approximately 11:58 UT fade. These observations are passage two pairs moderately intense TCVs followed by third very pair. associated trailing pair, thought to be result an upward current. Measurements suggest that pressure change may responsible for triggering first TCVS, subsequent sudden orientation IMF have produced pair aurora] brightening. particle indicate occur field lines map boundary sheet or outer edge low latitude layer.