Physics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3602105w&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 2, CiteID L02105
Physics
2
Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409), Ionosphere: Current Systems (2721), Magnetospheric Physics: Magnetic Storms And Substorms (7954), Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431)
Scientific paper
During the 90-day Space Technology 5 (ST-5) mission, a total of 2535 auroral field-aligned current (FAC) signatures were identified. Of these 1030 were suitable to be modeled as semi-infinite current sheets aligned with L-shells and moving with constant speed in the north or south directions (hereafter called FAC speed). FAC speeds were found to range from -1 to 1 km/s with larger mean magnitude during intervals of higher geomagnetic activity. At ST-5 altitudes, ~300 to 4500 km, the median relative errors in FAC thickness and current density, when stationary FAC is assumed, are 4%. When the ST-5 FAC speed determinations are extrapolated along the IGRF-10 magnetic field lines, these errors increase to 23% and 24% at 4 RE, and 65% and 124% at 8 RE, respectively.
Boardsen Scott A.
Le Guan
Slavin James Arthur
Strangeway Robert J.
Wang Yadong
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