Propagation of geomagnetic pulsations in magnetospheric ducts

Details Propagation of geomagnetic pulsations in magnetospheric ducts Propagation of geomagnetic pulsations in magnetospheric ducts

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ge%26ae..24...94l&link_type=abstract

Geomagnetizm i Aeronomiia (ISSN 0016-7940), vol. 24, Jan.-Feb. 1984, p. 94-98. In Russian.

Physics

3

Geomagnetic Pulsations, Magnetohydrodynamic Waves, Magnetospheric Instability, Plasma Cylinders, Plasmaguides, Wave Propagation, Magnetic Equator, Magnetohydrodynamic Stability, Spatial Distribution

Scientific paper

The propagation of Pc1-Pc3 pulsations in magnetospheric ducts is examined. It is shown that an Alfven waveguide can exist in ducts in the form of cylindrical plasma structures when (u)(k sub z)(R) is greater than beta, where beta is about 1. The longitudinal variation of the duct characteristics causes (u)(K sub z)(R) (which is much greater than unity at the equator) to become less than beta with distance from the equator; consequently the waveguide disappears. Attention is given to conditions under which the effective amplification of Pc1 pulsations occurs in the near-equatorial instability region.

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