Lobe Cell Convection and Polar cap Precipitation

Details Lobe Cell Convection and Polar cap Precipitation Lobe Cell Convection and Polar cap Precipitation

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12a0481e&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM12A-0481

Physics

2431 Ionosphere/Magnetosphere Interactions (2736), 2455 Particle Precipitation, 2463 Plasma Convection, 2740 Magnetospheric Configuration And Dynamics, 2748 Magnetotail Boundary Layers

Scientific paper

The characteristic electric and magnetic field signature of lobe cells as observed by the low-altitude FAST satellite are compared with Polar ultraviolet images of polar cap auroral activity. Initial results from 55 events 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. Moreover, the presence of lobe cells coincide with UV data intensifications in the premidnight 2100-2400 MLT sector and/or the postnoon 1500 MLT region in ~54% 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 events occurred during enhanced AE index substorm-like conditions and that generally stronger AE indices are measured for stronger IMF By magnitudes.

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