Influence of Geomagnetic Storms On VHFIonospheric ScintillationsAtNear Equatorial Station Anantapur

Abstract

The effect of geomagnetic storms on the occurrence of ionosphere scintillations has been studiedusing the data of amplitude scintillations. To study these effects, we have analyzed VHFscintillations recorded at Anantapurduring the period March 1997 to April 1999. In the present study the scintillation data obtained from FLEETSAT radio beacon signal of 250.649MHz at this near equatorial station, Anantapur (14.7° N, 77.7° E, and Dip 15.4 ° N) India, during some specific storm periods of varying strengths have been examined in association with the occurrence of maximum negative excursion of equatorial DST. An attempt is made to identify and delineate the effects of storms on scintillation occurrences during Pre and post Midnight Hours.