Physics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31..323a&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 31, March 1983, p. 323-330.
Physics
22
Earth Ionosphere, Extremely Low Radio Frequencies, Geomagnetic Pulsations, Magnetohydrodynamic Waves, Equatorial Atmosphere, Plasma Resonance, Traveling Waves
Scientific paper
Recent theoretical work has predicted the possible existence of 'quarter-wave' ULF pulsation resonances, in which the wave electric field has a near-node in one ionosphere and an antinode in the conjugate ionosphere. Eigenvalues are derived for quarter-wave toroidal and guided poloidal resonances for a range of L-values and plasma density distributions. From these eigenvalues, resonant periods can be obtained. Three pulsation events with anomalously long periods (when interpreted as half-waves) are examined in the light of these results. It is decided that only one event is a good candidate for quarter-wave status; this event seems likely to be a driven resonance effectively in the quarter-wave guided poloidal mode.
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