Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.1409a&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A2, p. 1409-1417.
Physics
24
Field Aligned Currents, Magnetohydrodynamic Waves, Planetary Magnetospheres, Ponderomotive Forces, Standing Waves, Magnetic Field Configurations, Magnetosphere-Ionosphere Coupling, Planetary Ionospheres, Plasma Density
Scientific paper
Previously published perturbation series for toroidal mode eigenfunctions and eigenvalues are used to derive the field-aligned second-order force and acceleration generated by standing Alfven waves in a dipolar magnetosphere. The field-aligned ponderomotive force and ponderomotive acceleration (PMA) are derived by time integration. The second-order acceleration and the PMA are independent of the plasma mass density distribution in the equatorial plane, and are only weakly dependent on the density structure along magnetic field lines. The second-order acceleration has an oscillation at twice the standing wave frequency superimposed on the PMA at a given position. The amplitude and phase of this oscillation are dependent on ionospheric conductance and field-aligned density structure. The PMA has an approximate L exp 5 dependence, and can have relatively large values in the outer magnetosphere.
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