Application of heterogeneous mesospheric ion-chemistry model to MST radar echoes over low latitude

Srinivas, N. and Prasad, B. S. N. and Datta, Jayati and Chakravarty, S. C. (2007) Application of heterogeneous mesospheric ion-chemistry model to MST radar echoes over low latitude. Advances in Space Research, 39 (8). 1256 - 1266. ISSN 1879-1948

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MST radar studies at low latitude stations have documented regions in the mesosphere from where enhanced echoes (Low Latitude Mesospheric Echoes (LMEs)) are observed. Such echoes cannot, in general, be explained by considering the dynamical aspects (such as turbulence, winds, waves, etc.) of the region alone. Mesospheric dust/aerosols can enhance the radar echoes considerably and dust is known to exist at all heights and latitudes of the mesosphere. This study investigates the presence of dusty plasma in the mesosphere through the heterogeneous ion-chemistry of the region. Dust of meteoric origin is incorporated in the conventional ion chemistry scheme and the equilibrium height profiles of charged and neutral dust densities corresponding to effective dust sizes (radii) of 1, 10 and 30nm are computed for the equatorial quiet daytime conditions. The model derived dust density profiles show structures with respect to dust size, height and season that are indicative of the possible role of mesospheric dust in the production/enhancement mechanisms of the LMEs observed over the equatorial station at Gadanki (13.5°N, 79.2°E), India.

Item Type: Article
Uncontrolled Keywords: Mesospheric dust, Mesospheric ion-chemistry, LMEs
Subjects: D Physical Science > Physics
Divisions: Department of > Physics
Depositing User: C Swapna Library Assistant
Date Deposited: 21 Sep 2019 06:01
Last Modified: 21 Sep 2019 06:01

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