Damping of magnetospheric cavity modes

Details Damping of magnetospheric cavity modes Damping of magnetospheric cavity modes

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9411843a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Sept. 1, 1989, p. 11843-11853.

Physics

12

Earth Magnetosphere, Magnetohydrodynamic Waves, Solar Terrestrial Interactions, Atmospheric Models, Coupled Modes, Extremely Low Radio Frequencies

Scientific paper

The coupling of magnetospheric cavity modes to the field line continuum is discussed. It is found that the time scales for dissipative phase mixing and mode conversion to kinetic Alfven waves in the magnetosphere are longer than the lifetimes of MHD wave events with periods that vary continuously with radial distance. It is suggested that the ultimate dissipative sink for cavity mode energy should be the ionosphere. An expression is given for the magnetospheric cavity mode damping via coupling to the field line continuum.

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