Other
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....8611258t&link_type=abstract
Journal of Geophysical Research, vol. 86, Dec. 1, 1981, p. 11258-11264.
Other
6
Flow Equations, Magnetohydrodynamic Stability, Magnetopause, Magnetospheric Instability, Oscillating Flow, Propagation Modes, Compressible Flow, Electron Energy, Extremely Low Radio Frequencies, Ion Temperature, Kelvin-Helmholtz Instability, Magnetosheath, Nonuniform Flow, Radial Velocity, Two Fluid Models, Uniform Flow
Scientific paper
Dispersion equations of hydromagnetic oscillations in the magnetopause-magnetosheath region are derived in the two-fluid approximation with the ion temperature greater than the electron temperature. In the derivation, a finite thickness of the magnetosheath and the presence of the mean ion drift motion in the magnetosphere are considered, in addition to the tangential uniform flow in the magnetosheath. It is shown that there are two different types of oscillations in the region, which are in general coupled to each other. One comprises radial oscillations related to the nonuniform compressed flow in the magnetosheath; the other is the Kelvin-Helmholtz instability of boundary waves due to the tangential flow. The fundamental mode of the former oscillation, taking a maximum displacement at the magnetopause, exhibits an eigenperiod of eight minutes, which is comparable with that of the observed oscillations obtained by particle data of ISEE 1 and 2 satellites.
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