Geomagnetic pulsations associated with MHD-waveguide in magnetospheric ducts

Details Geomagnetic pulsations associated with MHD-waveguide in magnetospheric ducts Geomagnetic pulsations associated with MHD-waveguide in magnetospheric ducts

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35.1093b&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, Sept. 1987, p. 1093-1097, 1099, 1100.

Computer Science

2

Geomagnetic Micropulsations, Magnetohydrodynamic Waves, Plasma Resonance, Plasma-Electromagnetic Interaction, Wave Propagation, Atmospheric Models, Earth Surface, Polarization Characteristics, Propagation Modes

Scientific paper

A theory of waveguide propagation of MHD waves in magnetospheric ducts (detached plasma regions) is presented. It is shown that Alfvenic waveguide modes can be excited due to the resonance interaction with the waveguide FMS modes. The Alfvenic modes penetrate to the ground and lead to electromagnetic field variations, registered as local geomagnetic Pcl-2 pulsations. The problem of the Alfvenic waveguide modes propagation from the magnetosphere to the earth's surface is considered and a comparison is made of theoretical results with experimental data.

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