Gravity wave momentum fluxes estimated from long-term airglow imaging observations at middle and equatorial latitudes

Details Gravity wave momentum fluxes estimated from long-term airglow imaging observations at middle and equatorial latitudes Gravity wave momentum fluxes estimated from long-term airglow imaging observations at middle and equatorial latitudes

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa21a0235s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA21A-0235

Physics

0310 Airglow And Aurora, 3332 Mesospheric Dynamics, 3384 Acoustic-Gravity Waves

Scientific paper

We made statistical analyses of momentum flux carried by small-scale gravity waves observed by the all-sky imagers for the OH airglow emission. We analyze the gravity wave spectra with high precision, including a procedure to remove the Milky Way structure in the images. The gravity waves observed at Kototabang, Indonesia (100.3E, 0.2S) for October 2002 June 2005 had horizontal wavelengths of 40-80 km, apparent phase speeds of 40-70 m/s, and intensity perturbations of less than 3%. Strong preference in the propagation direction was not recognized. From the satellite OLR data, convective activity in the troposphere was high over Kototabang throughout the year. This is probably the reason why the strong preference in the propagation direction was not recognized at Kototabang. The momentum flux averaged over all the gravity wave events was 7.8 m2/s2. In the presentation, we will compare the characteristics of gravity waves and momentum fluxes observed at Kototabang with those obtained at Shigaraki, Japan (136.1E, 34.9N) from June 2000 to June 2006.

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