High-resolution mesospheric layer structures from MST radar backscatter echoes over low latitude

Details High-resolution mesospheric layer structures from MST radar backscatter echoes over low latitude High-resolution mesospheric layer structures from MST radar backscatter echoes over low latitude

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66..859c&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 10, p. 859-866.

Physics

2

Mesospheric Turbulence, Mesospheric Dynamics, Mesospheric Scattering, Ionisation Irregularities, Mst Radar, Rocket Probes

Scientific paper

The MST radar facility located at the low latitude Indian station Gadanki (13.5°N,79.2°E) has been used to study the high-resolution spatial structure of the mesospheric return echo power and relate these to the dynamics and electron density irregularities of the region. Special observations carried out using narrow pulse lengths indicate presence of scattering layers down to ~600m embedded in the broad turbulence field of about 4-5km thickness around 75km height region of the mesosphere. Possible cause of generation of such thin layer structure is examined. The percentage amplitudes of the 3m electron density irregularity profile are reconstructed for 200m height resolution from the past rocket borne results over SHAR (13.7°N,80.2°E) close to the radar site. At least two rocket results showed that apart from considerable increase in percentage amplitudes of the 3m size irregularities in the mesospheric height region of 70-80km, there is evidence of presence of thinner layers of these irregularities similar to that observed in the radar backscatter intensity. Implications of these results are analysed and directions for further research suggested.

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