Gravity wave momentum flux estimated from airglow images in the equatorial mesopause region

Details Gravity wave momentum flux estimated from airglow images in the equatorial mesopause region Gravity wave momentum flux estimated from airglow images in the equatorial mesopause region

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa53a1147s&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA53A-1147

Physics

0310 Airglow And Aurora, 3334 Middle Atmosphere Dynamics (0341, 0342), 3384 Acoustic-Gravity Waves

Scientific paper

We are developing a code to estimate vertical fluxes of horizontal momentum carried by small-scale (< 100 km) atmospheric gravity waves from OH airglow images. Propagation direction, horizontal wavelength, horizontal phase velocity, and amplitude of gravity waves are estimated from the two-dimensional cross-periodogram of two sequential time-differenced images, by a procedure similar to that developed by Tang et al. [IEEE, 2005]. With these parameters and traditional Krassovsky's ratio, momentum flux is estimated from the polarization relations of gravity wave. We applied the method to the airglow images obtained at Kototabang, Indonesia (0.2S, 100.3E), from October 2002 to June 2005. The background wind data, which are essential to know the intrinsic motion of gravity wave, were simultaneously measured 97 clear-sky nights in the observation period by a meteor radar installed at Kototabang. In the presentation, we will report statistical results of the variations of gravity wave momentum flux and background wind velocities in the equatorial mesopause region.

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