An emission layer as a gravity wave detector |
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| Authors: | AN Belyaev |
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| Institution: | 1. Radio and Atmospheric Physics Lab, Rajdhani College, University of Delhi, India;2. Department of Physics and Astrophysics, University of Delhi, India;3. Space Physics Laboratory, VSSC, Trivandrum, India;4. COSMIC Program Office, University Corporation for Atmospheric Research, Boulder, CO, USA;5. AORI, University of Tokyo, Japan;6. Department of Geophysics, Kyoto University, Kyoto, Japan;1. Skobeltsyn Institute for Nuclear Physics of Lomonosov Moscow State University, Moscow, Russian Federation;2. Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic;3. Joint Institute for Nuclear Research, Dubna, Russian Federation;4. Physics Department of Lomonosov Moscow State University, Moscow, Russian Federation |
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| Abstract: | A three-dimensional model is used to investigate the relations between parameters of atmospheric gravity waves (GW) and the spatial structure of O2 atmospheric (0,0) nightglow wave perturbations observed from space. It is shown that observed perturbations may be divided into the linear and nonlinear parts. The linear perturbations appear as wavelet signatures observed at certain viewing directions. The nonlinear part of the perturbations causes an increase in all sky brightness of the O2 atmospheric (0,0) nightglow. The model shows that at certain viewing directions the cancellation effect for waves passing through the emission layer disappears. The latter gives the opportunity to create the complete set of functions that may be used for the spectral decomposition of observed brightness field. The obtained spectrum may be interpreted in terms of the Fourier coefficients of 3D-decomposition of the temperature fluctuations induced by gravity waves just near the emission layer. |
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