The behavior of magneto-acoustic-gravity waves near the cusp resonance in a lossless, compressible, isothermal, stratified, electrically conducting, and uniformly magnetized atmosphere. I - Mode conversion approach

Details The behavior of magneto-acoustic-gravity waves near the cusp resonance in a lossless, compressible, isothermal, stratified, electrically conducting, and uniformly magnetized atmosphere. I - Mode conversion approach The behavior of magneto-acoustic-gravity waves near the cusp resonance in a lossless, compressible, isothermal, stratified, electrically conducting, and uniformly magnetized atmosphere. I - Mode conversion approach

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phflb...1.1385k&link_type=abstract

Physics of Fluids B (ISSN 0899-8221), vol. 1, July 1989, p. 1385-1395.

Physics

5

Atmospheric Physics, Gravity Waves, Magnetoacoustic Waves, Atmospheric Stratification, Differential Equations, Electrical Resistivity, Magnetic Field Configurations, Polar Cusps, Wave Propagation

Scientific paper

The propagation of (internal) magneto-acoustic-gravity waves is analyzed in a compressible, isothermal, stratified, electrically conducting atmosphere that is permeated by a uniform, nearly horizontal magnetic field. The conversion, near the so-called cusp resonance of a long acoustic-gravity wave into a short slow magneto-acoustic wave, is demonstrated by means of boundary-layer theory based on the smallness of the vertical component of the magnetic field. The magneto-acoustic wave subsequently carries the energy off upward, which in the limit of a horizontal magnetic field would be fed into the cusp resonance ad infinitum. This gives rise to singular fields. The scaling of the tendency toward singular behavior of a field quantity with the obliqueness of the magnetic field is discussed, as well as the partial reflection of the long acoustic-gravity wave.

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