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Title: Meteor Wind Radar Studies at Waltair
Authors: Devara, P C S
Ahmed, M I
Rao, M Srirama
Rao, B Ramachandra
Issue Date: Dec-1981
Publisher: NISCAIR-CSIR, India
Abstract: Various results obtained since the middle of June 1979 by a meteor wind radar system developed at Nagarampalem field station, Waltair (, 17°43'N; long., 83°18'E) for studying neutral winds in the altitude range 80-110 km, are reviewed. The signal-to-noise ratio (Pr/Pn) computations for the system reveal that the meteor trails with critical line density of 2.4 x 1014/m give values of 42-52 dB for transmitter powers of 2.5-20 kW. The radio meteor echo data observed on both shower and non shower periods exhibited diurnal variation with early morning peak and evening dip. The echo duration and diffusion coefficient measurements show that the most probable echo duration is 0.06 sec while the diffusion coefficient (log10 D) is varying between 4.6 and 5.5 cm2/sec. The diurnal variation of the diffusion coefficient depicts a broad maximum during morning hours and a broad minimum during evening hours. A least square Fourier analysis of the wind observations showed the dominance of the diurnal component for most of the time over the other components of the tidal spectrum: The prevailing component is observed to vary from 6 to 25 m/sec for zonal wind and from 0.2 to 18 m/sec for meridional wind. The day-to-day variability in the phase of diurnal and semidiurnal components is found to be much higher for the zonal wind than for the meridional wind. Long period wind oscillations with periodicities between 2 and 5 days are observed and their association with the pressure and temperature variations at the earth's surface has been explained.
Page(s): 228-236
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.10(6) [December 1981]

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