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Title: Study of Medium-scale Travelling Ionospheric Disturbances Using Multistation ATS-6 Faraday Rotation Data
Authors: Deshpande, M R
Rastogi, R G
Sengupta, A
Nagpal, O P
Setty, C S G K
Jain, A R
Rai, R K
Janve, A V
Patwari, V M
Subbarao, B S
Issue Date: Oct-1980
Publisher: NISCAIR-CSIR, India
Abstract: Faraday rotation of 140 MHz signals from statelIite ATS-6 recorded at four neighbouring stations, namely, Bombay, Rajkot, Ahmedabad and Udaipur, have been used in the present study to find the periods, speeds and azimuth of medium-scale TIDs in the F-region. The study is confined to winter months of 1975-76. AIl the cases considered are daytime events since the winter nighttime TID occurrence is very rare. The speeds are found to vary from 54 to 314 m/sec covering azimuthal directions between 114 and 173° East of North. The general features of the speeds and azimuthal directions of the TIDs seem to indicate their origin in the tropospheric jet streams. Ray-tracing calculations carried out from the observation point (in the ionosphere) to the troposphere support this point strongly. It is believed that dynamic instability associated with vertical wind shear layers within the jet stream may be the chief cause for the generation of gravity waves which produce the observed TIDs.
Page(s): 186-190
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.09(5) [October 1980]

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