Other
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.5811l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, April 1, 1991, p. 5811-5817.
Other
30
Cold Plasmas, Earth Magnetosphere, Extremely Low Radio Frequencies, Magnetic Dipoles, Magnetohydrodynamic Waves, Magnetopause, Fourier Transformation, Kelvin-Helmholtz Instability, Laplace Transformation, Wave Equations
Scientific paper
Hydromagnetic waves are studied in the dipole magnetosphere for the case when an almost monochromatic energy source is assumed to be located at the magnetopause. The wave spectrum is investigated through a fast Fourier transform, and the wave structures are shown on the meridional plane. It was found that relatively large amplitude field line resonances (FLR) are produced only where the source frequency is matched to a harmonic of the Alfven shear modes. On the other hand, the compressional wave spectra become rather broadbanded. It is suggested that boundary effects may be responsible for the broadening of these spectra. It is also suggested that the narrow bandwidth of the source plays an important role in determining the nature of the FLR excitations. These results may help to explain why compressional and transverse ULF wave spectra are often found to be broadbanded even in the presence of a monochromatic source.
Lee Dong-Hun
Lysak Robert L.
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