On the possibility of in situ shear excitation of vortical perturbations and their coupling with short-period gravity waves by airglow and ionosphere observations

Details On the possibility of in situ shear excitation of vortical perturbations and their coupling with short-period gravity waves by airglow and ionosphere observations On the possibility of in situ shear excitation of vortical perturbations and their coupling with short-period gravity waves by airglow and ionosphere observations

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.1105d&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 8-11, p. 1105-1116.

Physics

4

Scientific paper

The essential part of in situ shear excited vortical perturbations (shear waves) at mesosphere-thermosphere heights is considered by use of airglow, from Abastumani (42.8°E, 41.8°N), and ionospheric, from Tbilisi (44.8°E 41.7°N), observations. One of the characteristic processes for excitation of vortical perturbations (shear waves) is a phenomenon of its possible transformation into short-period atmospheric gravity waves (GWs) with a frequency close to the Brunt-Väisälä frequency (BVf). More convenient condition for shear excitation of vortical perturbations and their transformation into short-period GWs at mesosphere-thermosphere heights appears on magnetically disturbed days and during the mid-latitude springtime transition. Nighttime observations of intensities of the hydroxyl OH(8-3) band, the oxygen green 557.7 and red 630.0nm lines from Abastumani show a possible presence of shear excited vortical perturbations and an accumulation of wave energy by short-period GWs with frequencies close to BVf on magnetically disturbed days and during springtime transition. The amplitude amplification of short-period gravity waves is considered as a possible indicator of regional and planetary scale changes of the horizontal wind in the upper atmosphere.

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