Excitation and decay of magnetospheric lobe cell convection and its associated aurora

Details Excitation and decay of magnetospheric lobe cell convection and its associated aurora Excitation and decay of magnetospheric lobe cell convection and its associated aurora

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3597s&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 24, p. 3597-3600

Physics

2

Ionosphere: Auroral Ionosphere, Ionosphere: Plasma Convection, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

We discuss multi-instrument observations of the excitation and decay within a ~10 min interval of a convection pattern typical of lobe cells, centered at ~1230 MLT in the winter hemisphere. The plasma convection and its associated aurora were triggered by a rapid northward turning of the interplanetary magnetic field (IMF) monitored by near-Earth spacecraft. The IMF stayed northward oriented (Bx=-4nT By=2-3nT Bz=2-4nT clock angle=30°-70°) for 8 min, before rotating back south. The optical instruments recorded the activation of an east-west aligned auroral form near the latitude of the pre-existing cusp aurora at ~73° MLAT, which was followed by a smooth, 10-min long poleward advance at an average speed of 0.4 km s-1, reaching 75° MLAT at its most expanded phase. Simultaneous CUTLASS radar and local magnetic data confirm the occurrence of a large reconfiguration of plasma convection involving a change from antisunward to sunward flow components in the vicinity of the cusp, consistent with the presence of a lobe cell.

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