Physics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...85...83e&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 85, May 1983, p. 83-91.
Physics
1
Gravity Waves, Magnetic Effects, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Midlatitude Atmosphere, Planetary Waves, Zonal Flow (Meteorology), Atmospheric Circulation, Boussinesq Approximation, Geomagnetism, Magnetic Field Configurations
Scientific paper
Hydromagnetic planetary-gravity waves propagating on a β-plane through a zonal flow and transverse magnetic field are examined for instability. Such instabilities may be related to the same physical phenomena in the atmospheres of the Sun and planets and in the Earth's core. It is found that the onset of instability depends on the directions of the vertical and transverse wave-numbers and the zonal flow. It is also shown that as the magnetic field intensity is kept uniform instability can onset provided that the zonal flow strength does not exceed a certain factor, which depends on the parameters of the medium, and then the zonal wavenumbers that can become unstable are limited to a given range. If the basic Alfvén wave speed is allowed to vary whereas the zonal flow is kept uniform the zonal wavenumbers that can exhibit instability are again limited but the basic Alfvén wave speed can assume any value.
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