Dispersive properties of ULF waves at surfaces with finite width and finite temperature

Abstract

The dispersion relation for surface eigen modes with a finite width and having finite temperature is derived. The model surface may be identified with the magnetopause or the plasmapause. The spectrum depends on the temperature and the width of the surface. Basically there are two distinct branches, one of which is in the higher frequency range than the other. The possible implications of these models in geomagnetic micropulsation, have been presented and discussed.