Physics
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..877l&link_type=abstract
Geophysical Research Letters, vol. 7, Nov. 1980, p. 877-880.
Physics
Atmospheric Electricity, Electric Fields, Geomagnetic Tail, Plasma Layers, Charged Particles, Electric Field Strength, Magnetic Storms, Magnetohydrodynamic Flow, Particle Motion
Scientific paper
It is shown that the north-south component of electric fields in the plasma sheet can be estimated uniquely from simultaneous measurements of plasma flow components and the magnetic field components in the equatorial plane. The estimated field strength ranges from 0.3 to 7.8 mV/m during substorms at geocentric distances beyond approximately 15 earth radii. During the magnetospheric substorm expansion phase, the north-south component of the electric fields is almost oppositely directed from what one would expect on the basis of a projection of the general pattern of the ionospheric electric field to the plasma sheet along geomagnetic field lines (assumed to be equipotential). It is only during the recovery phase when both electric field patterns become similar. The result also suggests that strong fields occur preferentially near the plasma sheet boundary rather than near the neutral sheet region.
Akasofu Syuh-Ichi
Lui Anthony Tat Yin
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