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|Title:||Different methods to study gravity wave variance -A comparison|
Hussain, S Nasir
Basha, H Aleem
|Abstract:||Hourly wind observations made by Indian MST radar at Gadanki have been used to study gravity wave variance of period 2-6 h. Variance was calculated after the wind data were high-pass filtered with a cut-off period of 6 h. The data from the output of high-pass filter are used to calculate total horizontal variance for this band. Variance has also been calculated by power spectral density method using the filtered data. The irregular winds have been studied by another method which does not require continuous data. In this method, two successive hourly wind height profiles are subtracted which is supposed to give information of gravity waves of period 2-6 h. It is observed that this difference filter gives little higher value of variance showing that the cut-off is not sharp. This method is quite useful to obtain information from discontinuous data sets.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.29(4) [August 2000]|
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