Kalpana Patel, A. K. Singh^*, R. P. Patel and R. P. Singh¹
Atmospheric Research Laboratory, Department of Physics, Banaras Hindu University,
Varanasi 221 005, India ¹Vice-Chancellor, V.K.S. University, Ara, Bihar, India

Abstract. The observations of daytime ionospheric scintillation are at- tributed 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^o N, long. = 154^o E) are analyzed to study the behaviour of sporadic-E irregularities dur- ing 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 spec- tral 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.

Keywords: ionospheric irregularities - VHF scintillations - sporadic-E - wave propagation.

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