Physics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.7095s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Sept. 1, 1983, p. 7095-7106. Research supported by the U.S. Defense N
Physics
13
Electric Fields, Ion Currents, Ionospheric Drift, Plasma Clouds, Plasma Jets, Geomagnetism, Magnetic Fields, Magnetohydrodynamic Waves, Plasma Conductivity
Scientific paper
It is determined that the combination of ion-Pedersen currents and parallel electric field significantly affect both the jetting of ionospheric plasma clouds transverse to the geomagnetic field and the Alfven waves generated by the moving plasma. The 'frozen-in' field approximation is invalidated due to the ion-Pedersen currents and parallel electric fields, which cause the Alfven waves to decay. An eigenvalue condition on the size of the plasma cloud transverse to the geomagnetic field and the direction of cloud motion is also implied. The likelihood that the Alfven waves can cause an electromagnetic pulse on the ground is reduced due to the attenuation of these waves, which indicates that the initial directed energy in the plasma jet is coupled, over great distances, to ions and electrons. It is proposed that two phenomena occur at higher altitudes where neutral and ambient densities become smaller. First, plasma clouds are significantly displaced with an accompanying temporary change in the geomagnetic field. Second, the Alfven waves created in response to the motion of plasma clouds are shown to be less subject to attenuation and more likely to cause an electromagnetic pulse on the ground.
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