Effects of azimuthal asymmetry on ULF waves in the dipole magnetosphere

Details Effects of azimuthal asymmetry on ULF waves in the dipole magnetosphere Effects of azimuthal asymmetry on ULF waves in the dipole magnetosphere

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17...53l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Jan. 1990, p. 53-56.

Physics

10

Earth Magnetosphere, Extremely Low Radio Frequencies, Magnetohydrodynamic Waves, Magnetohydrodynamics, S Waves, Coupled Modes, Critical Frequencies, Finite Difference Theory, Magnetic Dipoles, Magnetic Field Configurations, Plasmapause

Scientific paper

The properties of the coupling of compressional and transverse ULF waves strongly depend on the azimuthal wavenumber m. These effects are studied in a numerical model of ULF wave propagation in a dipolar magnetosphere. As m becomes larger, the frequencies of the global modes are increased, each coupling location is shifted toward the plasmapause, and the wave energy of global compressional modes in the magnetosphere is confined to a smaller region near the magnetopause. These conclusions are qualitatively consistent with previous analytical and numerical models.

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