Ionospheric scintillations by sporadic-E irregularities over low latitude

Astronomy and Astrophysics – Astronomy

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Ionospheric Irregularities, Vhf Scintillations, Sporadic-E, Wave Propagation.

Scientific paper

The observations of daytime ionospheric scintillation are attributed to E-region irregularities at high and equatorial latitudes. In this paper, VHF amplitude scintillations recorded during the daytime period from 1991 to 1999 at low latitude station Varanasi (geomag. lat. = 14° 55' N, long. = 154^0 E) are analyzed to study the behaviour of sporadic-E irregularities during the active solar and magnetic periods. The daytime digital scintillation data have been analyzed to study some important parameters of scintillation producing sporadic-E irregularities like auto-correlation function, power spectral densities, signal de-correlation time etc. We report the behaviour of these parameters under weak and strong scintillation conditions. The results are also discussed in the light of recent works.

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