Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..647a&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 9, p. 647-654.
Physics
11
Earth Ionosphere, Magnetohydrodynamic Waves, Propagation Velocity, Wave Propagation, Geomagnetic Pulsations, Spatial Distribution
Scientific paper
The essentials of the theory of hydromagnetic wave beam propagation through the ionosphere are given. The regions on the earth with different horizontal velocities are predicted. These change from 10 km/s for small distances up to Alfven velocities at distances of about 1000-2000 km from the beam axis. We demonstrate a strong influence of geoelectric section on the electromagnetic field distribution for distances comparable with the earth's skin depth. For distances of more than 4000 km from the beam axis the spatial distribution is defined by an atmospheric wave, the main features of which are small spatial decrements and a velocity close to the speed of light along an atmospheric wave-guide. The spatial distribution of the fields nearest to the resonance magnetic shell has been studied in detail. The adverse influence of ionospheric irregularities on the ground magnetic field of geomagnetic pulsations is discussed briefly. Analytical expressions for the fields, under arbitrary two-dimensional inhomogeneities with transverse electric field, of the initial Alfven wave are given.
Alperovich L. S.
Fedorov E. N.
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