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Ann. Geophys., 20, 1869-1876, 2002
www.ann-geophys.net/20/1869/2002/
© European Geosciences Union 2002
Observations on Stratospheric-Mesospheric-Thermospheric temperatures using Indian MST radar and co-located LIDAR during Leonid Meteor Shower (LMS)
R. Selvamurugan1, C. V. Devasia2, A. R. Jain1, C. Raghava Reddi3, P. B. Rao1, and R. Sridharan2
1National MST Radar Facility, Tirupati, 517 502, India
2Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum 695 022, India
3Andhra University, Waltair, Visakapatnam, India
Correspondence to: R. Selvamurugan
(Selvastella@indiatimes.com)
Abstract. The temporal and height
statistics of the occurrence of meteor trails during the Leonid meteor shower
revealed the capability of the Indian MST radar to record large numbers of
meteor trails. The distribution of radio meteor trails due to a Leonid meteor
shower in space and time provided a unique opportunity to construct the height
profiles of lower thermospheric temperatures and winds, with good time and
height resolution. There was a four-fold increase in the meteor trails observed
during the LMS compared to a typical non-shower day. The temperatures were
found to be in excellent continuity with the temperature profiles below the
radio meteor region derived from the co-located Nd-Yag LIDAR and the maximum
height of the temperature profile was extended from the LIDAR to ~110 km. There
are, how-ever, some significant differences between the observed profiles and
the CIRA-86 model profiles. The first results on the meteor statistics and
neutral temperature are presented and discussed below.
Key words. Atmospheric composition and structure
(pres-sure, density, and temperature) History of geophysics (at-mospheric
sciences) Meteorology and atmospheric dynamics (middle atmosphere dynamics)
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