Global structures of Alfven-ballooning modes in magnetospheric plasmas

Details Global structures of Alfven-ballooning modes in magnetospheric plasmas Global structures of Alfven-ballooning modes in magnetospheric plasmas

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2091v&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 19, p. 2091-2094

Physics

16

Ballooning Modes, Earth Magnetosphere, Magnetohydrodynamic Stability, Plasma Equilibrium, Wave-Particle Interactions, Anisotropy, Geomagnetic Pulsations, Magnetic Storms, Pressure Gradients

Scientific paper

We show that a steep plasma pressure gradient can lead to radially localized Alfven modes, which are damped through coupling to field line resonances. These have been called drift Alfven ballooning modes (DABM) by (Chen and Hasegawa, 1991) and are the prime candidates to explain Pc4-Pc5 geomagnetic pulsations observed during the recovery phase of geomagnetic storms. A strong dependence of the damping rate on the azimuthal wave number m is established, as well as on the equilibrium profile. A minimum azimuthal mode number can be found for the DABM to be radially trapped. We find that the higher m DABMs are better localized, which is consistent with high-m observations.

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