Computer Science
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39.1305s&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 39, Sept. 1991, p. 1305-1320.
Computer Science
10
Electric Fields, Geomagnetism, Magnetic Storms, Plasmasphere, Whistlers, Auroral Zones, Dynamo Theory, Interplanetary Magnetic Fields, Ionospheric Drift, Sudden Ionospheric Disturbances, Whistler Recorders
Scientific paper
Observations of the group time delay and Doppler shift of ducted VLF whistler mode signals propagating near L = 2.5 were used to deduce the azimuthal component of the plasmaspheric electric field during geomagnetically disturbed perioids in June and July 1986. The whistler mode signals originated in the U.S. Navy transmitters NAA and NSS and were recorded at Faraday, Antarctica. The average Eomega vs LT curve for periods when Kp is greater than 2(+) has been compiled; when this is compared with the Eomega vs LT curve for quiet times, it is found that the electric field is more eastwards from 18-22 LT and more westwards from 00-01 LT in disturbed times. This difference is consistent with published calculations of the penetration of the dawn-dusk electric field to L = 2.5. A variety of behavior is evident when the data are examined on a case to case basis. Sometimes the dawn-dusk electric field becomes apparent during isolated intense substorms; this is attributed to increased penetration due to an increase in the auroral zone Pedersen conductivity. On one night the drifts seemed to be partly due to the ionospheric disturbance dynamo.
Saxton John M.
Smith Anthony J.
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