Resonant harmonic Alfven waves in the magnetosphere - A case study

Details Resonant harmonic Alfven waves in the magnetosphere - A case study Resonant harmonic Alfven waves in the magnetosphere - A case study

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....8910757j&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Dec. 1, 1984, p. 10757-10762.

Physics

9

Earth Magnetosphere, Geomagnetic Pulsations, Harmonic Oscillation, Magnetohydrodynamic Waves, Plasma Drift, Electric Fields, Geos 2 Satellite, Magnetic Resonance, Polarization (Waves)

Scientific paper

Electric and magnetic field spectra obtained by GEOS 2 throughout Apr. 11, 1979 exhibit discrete frequency bands which last simultaneously for 5 hours. The periods of both pulsations increase toward the dusk sector. Strong evidence is adduced that the two frequency bands represent fundamental and second harmonic mode eigenoscillations of geomagnetic field lines. The phase relationship between the electric and magnetic field fluctuations of the higher frequency pulsation, the direction of the wave Poynting vector, and the occurrence of the event after the spring equinox, indicate that the major part of the wave energy is fed into the oscillation in the Southern Hemisphere, rather than those close to the equatorial plane.

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