Physics
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..291p&link_type=abstract
Geophysical Research Letters, vol. 5, Apr. 1978, p. 291-293.
Physics
2
Frequency Shift, Geomagnetic Pulsations, Magnetohydrodynamic Stability, Plasma Oscillations, Plasmapause, Cold Plasmas, Frequency Stability, Magnetohydrodynamic Waves, Plasma Density, Plasma Frequencies, Temperature Gradients
Scientific paper
The wave-drift instability at the plasmapause is reexamined by taking into account the effects of density and temperature gradients. Plasma parameters assumed are those for a cold plasma inside and for temperature up to about 13 eV outside the plasmasphere. The density is assumed to vary from 200/cu cm to 5/cu cm across the plasmapause. The parameter eta, defined as the partial derivative of the logarithm of the temperature with respect to the logarithm of density, varies from -0.6 to -3.3. Calculations indicate that the density and temperature gradients of the plasma satisfy the Alfven wave instability condition that gives internal generation of Pc 3 and Pc 4 geomagnetic pulsations with angular frequency of 0.01/sec.
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