Imaging observations of upper mesospheric nightglow emissions from Tirunelveli (8.7^oN)

Abstract

An all-sky airglow imager was installed at the equatorial site Tirunelveli (8.7^oN, 77.8^oE geographic; 1.34^oN magnetic dip) during January 2007 to study the small-scale dynamics occurring in the mesosphere-lower thermosphere (MLT) region. The instrument details are presented in the paper along with methods of information retrieval from the recorded data. The presence of a variety of small-scale mesospheric dynamical events, observed with the instrument, is demonstrated. Preliminary results on the observed features, viz. the quasi-monochromatic gravity waves and instability features, such as ripples and mesospheric bores, are presented in the paper.