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
作者:
LeonP. J. Kamp,
期刊:
Geophysical & Astrophysical Fluid Dynamics
(Taylor Available online 1990)
卷期:
Volume 53,
issue 4
页码: 257-271
ISSN:0309-1929
年代: 1990
DOI:10.1080/03091929008208929
出版商: Taylor & Francis Group
关键词: Magneto-acoustic-gravity waves;boundary layers;wave trapping;wave conversion
数据来源: Taylor
摘要:
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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