Ultralow-frequency fluctuations at the magnetopause

Details Ultralow-frequency fluctuations at the magnetopause Ultralow-frequency fluctuations at the magnetopause

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2419l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 22, p. 2419-2422

Physics

8

Extremely Low Frequencies, Magnetohydrodynamic Stability, Magnetopause, Plasma Waves, Atmospheric Boundary Layer, Energy Transfer, Mathematical Models

Scientific paper

A high-beta model for the generation of ultralow-frequency (ULF) fluctuations at the magnetopause is presented. The ULF waves are excited by the density gradients in the magnetopause boundary layer. For beta varying between 0.1 and 1.0, and for realistic values of the density gradients, the frequency range of the excited modes, their transverse wavelengths and their phase velocities parallel and perpendicular to the geomagnetic field lines seem to be in agreement with recent observations of Alfvenic structures at the magnetopause.

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