The behavior of magneto-acoustic-gravity waves near the cusp resonance in a lossless,compressible, isothermal,stratified, electrically conducting and uniformly magnetized atmosphere. II: The valve effect |
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| Authors: | Leon P J Kamp |
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| Institution: | 1. Department of Astrophysical, Planetary and Atmospheric Sciences , University of Colorado , Boulder, CO 80309, USA;2. Eindhoven University of Technology, Department of Physics , PO Box 513, NL-5600 MB, Eindhoven, The Netherlands |
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| Abstract: | Abstract In the present paper the behavior of (internal) magneto-acoustic-gravity waves near the cusp resonance in a lossless, compressible, isothermal, stratified, electrically conducting atmosphere that is permeated by a uniform, nearly horizontal magnetic field is re-addressed (Kamp, 1989). The previously analyzed linear conversion of long acoustic-gravity waves into short magneto-acoustic waves that carry off the energy from the resonance region along the magnetic field, is re-analyzed with boundary layer techniques that are based on the smallness of the vertical component of the magnetic field. More specifically the existence of the so-called valve effect for the generated magneto-acoustic mode near the critical level is explicitly demonstrated and shown to be governed by two rivalling effects. |
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| Keywords: | Magneto-acoustic-gravity waves boundary layers wave trapping wave conversion |
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