Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9811383a&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A7, p. 11,383-11,390.
Physics
20
Earth Magnetosphere, Magnetohydrodynamic Waves, Particle Energy, Ponderomotive Forces, Space Plasmas, Standing Waves, Equatorial Atmosphere, Particle Acceleration
Scientific paper
The magnitude and spatial structure of plasma energization by the ponderomotive acceleration (PMA) of standing Alfven waves are estimated. The second-order force and the PMA are rederived in a more straightforward and accurate way, and the structure of the PMA field, including the effect of gravity, is discussed. Energization of plasma particles by PMA is investigated, including the spatial structure of the energization relative to the structure of the acceleration fields. For the fundamental standing mode the converging node is at the equatorial plane, and the maximum specific energy there increases rapidly with L, becoming significant above L = 5 for typical wave amplitudes. At L of about 10, H(+) ions should reach energies of about 100 eV, and O(+) ions energies of about 2 keV. At reasonably high L, almost all the energization occurs at magnetic latitudes about +/- 56 deg.
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