Other
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38.1105t&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 38, Sept. 1990, p. 1105-1119. Research supported by NSERC.
Other
38
Airglow, Emission Spectra, Gravity Waves, Atmospheric Temperature, Temperature Dependence, Vertical Distribution, Wave Propagation
Scientific paper
The influence of gravity waves on airglow emissions is explored with a purpose of elucidating the observable effects of such waves. The results obtained are applicable to ground-based photometric observations, where the total line-of-sight emission, at an arbitrary zenith angle, is measured. Explicit relations are developed for the dependence of the magnitude and phase of the observable parameter eta, the ratio of brightness fluctuations to temperature fluctuations. Both magnitude and phase depend on dynamical parameters (wavelength and period), the zenith angle at which observations are made, and a chemical parameter which is specific to the reaction chemistry. Methods for distinguishing between evanescent and internal gravity wave modes and determining the vertical wavelength and sense of vertical propagation for internal modes are proposed. It is shown that, for an isothermal atmosphere, the dependence of eta on the characteristics of the perturbing wave is partially separable from the dependence on the emission chemistry, making it possible to draw conclusions about the effects of gravity waves on airglow brightness and temperature that are independent of any specific emission mechanism, as well as conclusions that are independent of specific wave characteristics.
Hines Colin O.
Tarasick David W.
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