Physics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99..179c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A1, p. 179-182
Physics
10
Geomagnetic Pulsations, Kinetic Theory, Magnetic Flux, Magnetohydrodynamic Flow, Transverse Waves, Wave Excitation, Wave Propagation
Scientific paper
Ion flux modulations by ultralow-frequency (ULF) radially polarized geomagnetic pulsations are examined theoretically based on the gyrokinetic analysis of Chen and Hasegawa (1991). The theoretical results thus contain important effects such as plasma anisotropy and inhomogeneities, finite Larmor radii, realistic magnetic field, magnetic trapping, and wave mode structures. The predicted properties are consistent with the satellite observations (Takahashi et al., 1990) and further support the drift-Alfven ballooning mode as a primary instability candidate. Our analysis, furthermore, demonstrates that, in the case of highly energetic ions, it is crucial to include the finite-Larmor-radius effects self-consistently in order to properly analyze and compare with the satellite observations.
Chen Liu
Hasegawa Akira
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