Other
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...262..760t&link_type=abstract
Astrophysical Journal, Part 1, vol. 262, Nov. 15, 1982, p. 760-767.
Other
27
Atmospheric Circulation, Magnetohydrodynamic Waves, Solar Atmosphere, Wave Dispersion, Solar Magnetic Field, Sunspots, Wave Equations, Wentzel-Kramer-Brillouin Method
Scientific paper
The local dispersion relation for magneto-atmospheric waves is discussed in terms of the linearized theory of waves in a plane-stratified, inviscid, perfectly conducting atmosphere under uniform gravity. The normally used local dispersion relation is demonstrated to not be unique, depending instead on the order of derivation from the fundamental first-order perturbation equations of continuity, momentum, energy, and induction. Furthermore, it is shown that the local dispersion relation predicts that the cutoff frequency decreases with increasing magnetic field strength, while the WKB approximation method projects an increase in the cutoff frequency with increasing magnetic field strength. A new form of the local dispersion relation is developed, and consideration is given to the special case of a global dispersion relation in conditions of an isothermal atmosphere with a horizontal magnetic field.
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