Physics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.9115l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Nov. 1, 1983, p. 9115-9124.
Physics
11
Ionospheric Currents, Magnetic Variations, Particle Precipitation, Radiation Belts, Antarctic Regions, Conjugate Points, Ground Stations, Magnetic Signatures, Time Lag
Scientific paper
Using sensitive riometers (30 MHz) and magnetometers at Siple Station, Antarctica, and at four locations in the conjugate area in the northeastern United States and Southern Quebec, the temporal and spatial extent of the impulsive losses of electrons from the radiation belts and the concurrent accompanying magnetic field variations produced by the changes in ionospheric current systems are studied. The impulsive variations have a short (about 2-4 s) onset time and about a 5-10 s decay time. The observed decay times in the riometer and magnetometer signals are consistent with the recombination times in the ionosphere at about 90-100 km. Often the magnetic field fluctuations are observed to occur primarily in the east-west direction and are out of phase between the southern and northern hemispheres. These observations suggest that predominantly north-south ionospheric currents are modified and/or produced by such impulsive precipitation. Time delays in the occurrence of the events between the northern and southern hemispheres, as well as time and spatial differences observed between the northern hemisphere stations, suggest that irregularly shaped, gradient B drifting patches of precipitating electrons could be the source of these impulsive events.
Lanzerotti Louis J.
Rosenberg T. J.
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