Physics
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94..485l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Jan. 1, 1989, p. 485-491.
Physics
1
Geomagnetism, Plasma Diagnostics, Plasma Drift, Ring Currents, Ampte (Satellites), Ionospheric Composition, Magnetic Storms, Plasma Density
Scientific paper
At the inner edge of the ring current (3-7 R-sub E), the three-dimensional plasma instrument from the AMPTE/IRM satellite sometimes obtains measurements of the pressure gradient and the resulting diamagnetic drift in the 20 eV to 40 keV ions. To the extent that the boundary may be considered a stationary structure moving past the satellite, a comparison of these measurements, along with simultaneous density and magnetic field measurements, allows the radial ring current velocity to be inferred. In this work, 11 ring current traversals have been selected from the 1985-1986 AMPTE/IRM data set corresponding to 1700-2200 LT; only quiet times were considered. These cases show a correlation between the radial motion of the ring current inner edge and its radial distance. It is speculated that, during quiet times, the motion may be purely convective, which implies westward electric fields of the order of 0.2-0.3 mV/m, consistent with previous measurements in this region.
LaBelle James
Paschmann Goetz
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