Dawn-dusk profile of field-aligned currents on May 11, 1999: A familiar pattern driven by an unusual cause

Details Dawn-dusk profile of field-aligned currents on May 11, 1999: A familiar pattern driven by an unusual cause Dawn-dusk profile of field-aligned currents on May 11, 1999: A familiar pattern driven by an unusual cause

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3777o&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 23, p. 3777-3780

Physics

2

Magnetospheric Physics: Current Systems, Magnetospheric Physics: Energetic Particles, Precipitating, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

On May 11, 1999, when the solar wind almost disappeared, the DMSP-F13 satellite observed two field-aligned current (FAC) sheets on both dawn and dusk sides. The dawnside FACs are identified as conventional region 1 (R1) and region 2 (R2) currents. The duskside FACs are collocated with intense polar-rain precipitation and are identified as midday region 1 and region 0 currents. Whereas the positive IMF BY observed explains the duskward shift/extension of those midday current systems, the extent of the distortion was unusual. It is inferred that the magnetospheric configuration was more axisymmetrical because of extremely low solar-wind dynamic pressure, and therefore the reconnection took place farther away from the midday sector. Conventional R1 and R2 currents as well as boundary layer-type precipitation were nearly absent at dusk, suggesting that the viscous interaction did not operate at least observably on the dusk side in the present event.

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