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Title: Detection of pre-sunrise echoes at mesospheric heights
Authors: Ratnam, M Venkat
Rao, T Narayana
Rao, S Vijaya Bhaskara
Rao, D Narayana
Kumar, Y Bhavani
Raghunath, K
Issue Date: Aug-2000
Publisher: NISCAIR-CSIR, India
Abstract: Indian MST radar located at Gadanki has been operated in special mode during equinox, i.e. on 23 and 24 Mar.1999 for detection of pre-sunrise echoes at mesospheric heights. These echoes are observed on both the days, 30 to 60 min before sunrise at ground level. On the first day, the radar is operated only in vertical direction and found that the echoes are highly intermittent in space and time similar to the daytime echoes. These echoes are observed mainly above 85 km with a peak at 90 km height on both the days. Echoes are also observed below these heights but less frequently. The Doppler shift and Doppler width on 23 Mar. 1999 is found to be of the order of +2 Hz and 4 ms-1, respectively. On 24 Mar. 1999, radar was operated by using three different beams (east, zenith Y and south) in order to see whether these echoes are due to turbulence or due to some other mechanism. Interestingly echoes in all the beam positions are observed indicating that the echoes are due to turbulence.
Page(s): 258-261
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.29(4) [August 2000]

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