Electromagnetic ion cyclotron waves in the terrestrial plasma depletion layer: Effects of possible differential speeds between thermal H+ and He2+ ions

Details Electromagnetic ion cyclotron waves in the terrestrial plasma depletion layer: Effects of possible differential speeds between thermal H+ and He2+ ions Electromagnetic ion cyclotron waves in the terrestrial plasma depletion layer: Effects of possible differential speeds between thermal H+ and He2+ ions

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10121553g&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A10, p. 21553-21560

Physics

4

Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Magnetosheath, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

The terrestrial plasma depletion layer (PDL) is characterized by electromagnetic ion cyclotron waves (EICWs) [Anderson et al., 1991, 1994; Anderson and Fuselier, 1993]. These are of two types, continuous (CON), where the wave power transverse to the local mean field decreases continuously with frequency, and bifurcated (BIF), where a diminution in wave activity occurs between two activity peaks [Anderson et al., 1994]. Linear kinetic theory of plasma waves has been applied successfully to explain many features of the observed spectra [Denton et al., 1993; Gary et al., 1993]. In this paper we complement these theoretical studies by examining the effects a possible relative motion between the thermal H+ and He2+ populations has on the ion cyclotron activity, illustrating theoretical predictions by comparison with observed CON and BIF spectra. We find that even a modest differential speed (Uα≡|vα|-|vp|~0.1vA, where VA is the local Alfvén speed) can regulate the presence, location, and strength of the diminution in wave power often observed between the upper (~0.55fp

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