Simultaneous airglow observations of medium-scale traveling ionospheric disturbances and mesospheric gravity waves at equatorial latitudes

Details Simultaneous airglow observations of medium-scale traveling ionospheric disturbances and mesospheric gravity waves at equatorial latitudes Simultaneous airglow observations of medium-scale traveling ionospheric disturbances and mesospheric gravity waves at equatorial latitudes

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa23a1899f&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA23A-1899

Physics

[2415] Ionosphere / Equatorial Ionosphere, [2435] Ionosphere / Ionospheric Disturbances, [2487] Ionosphere / Wave Propagation

Scientific paper

We observe nighttime medium-scale traveling ionospheric disturbances (MSTIDs) at Kototabang (0.2S, 100.3E, geomagnetic latitude: 10.6S), Indonesia by using a highly-sensitive all-sky airglow imager. In our previous study, we analyzed 630-nm airglow images obtained during 7 years from October 2002 to October 2009 and suggested that gravity waves generated from lower atmosphere propagate into the thermosphere to produce the observed MSTIDs. However gravity waves seen simultaneously in the mesospheric airglow images have not been investigated in these analyses. In this paper, we analyzed an MSTID event observed at Kototabang, Indonesia on 10 December 2010. Quasi-periodic southwestward MSTIDs were observed in 630-nm airglow images from the thermosphere at 16-18 UT (23-01 LT). Their horizontal phase velocity was 143 m/s and period was 50 min. They are similar to MSTIDs observed in our previous study. In the OH airglow images from the mesosphere, gravity waves were also observed. Their horizontal phase velocity (145 m/s) and period (45 min) were almost same as those of MSTIDs observed in 630-nm airglow images. According to the dispersion relation of gravity waves, we estimated vertical wavelength of the MSTIDs to be 130km by using horizontal phase velocity and wavelength obtained from the images and background neutral winds obtained by a Fabry-Perot interferometer. Since the vertical wavelength is larger than the 630-nm airglow layer thickness, we suggest that the MSTIDs propagate in the thermosphere as gravity waves. Based on these observations, we consider that the gravity wave in the mesosphere seen in the OH airglow images propagated into the thermosphere and produced the MSTIDs seen in the 630-nm airglow images.

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