Physics
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1198e&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 108, Issue A5, pp. SMP 11-1, CiteID 1198, DOI 10.1029/2002JA009725
Physics
8
Magnetospheric Physics: Plasma Convection, Magnetospheric Physics: Polar Cap Phenomena, Ionosphere: Particle Precipitation, Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Magnetospheric Physics: Storms And Substorms
Scientific paper
The characteristic electric and magnetic field signature of lobe cells as observed by the low-altitude FAST satellite in 55 dawn-dusk passes are compared with Polar ultraviolet images of polar cap auroral activity. Initial results from 34 events of UV image coverage suggest that there is an intimate coupling between the sunward convection flow of the lobe cell and transpolar auroral arcs or diffuse polar cap precipitation in ~62% of these cases. However, in some cases where the field signatures are suggestive of lobe cell convection, there is no detectable particle precipitation either in Polar UVI or the FAST data sets. Moreover, the presence of lobe cells coincide with UV data intensifications in the premidnight 2000-2400 MLT sector and/or the postnoon 1500 MLT region in ~59% of all cases with UVI coverage. The magnetic local time dependence of the lobe cells and polar cap precipitation on the interplanetary magnetic field (IMF) are examined using the upstream Wind monitor. The relative importance of the IMF By and Bz components are investigated and compared with the predictions of the antiparallel merging model and strongly suggests a connection with the magnetospheric sash, as is further implied by the mapping of magnetic field lines using the Tsyganenko [2002] (T01) model. It was also noted that a majority of lobe cell events occurred during enhanced AE index substorm-like conditions and that generally stronger AE indices are measured for stronger IMF By magnitudes during these events.
Bonnell J. W.
Carlson Carl W.
Ergun Robert E.
Eriksson Samantha
Parks George K.
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