at low latitude station Varanasi (geographic lat. = 25 • 15 N; long. = 82 • 59 E; geomagnetic lat. = 14 • 55 N, long. = 154 • E, dip angle = 37.3 • , sub-ionospheric dip = 34 • ) have been analyzed to study the behaviour of ionospheric E-region irregularities during the active solar and magnetic periods. The autocorrelation functions, power spectral densities, signal de-correlation times are computed to study the temporal features of ionospheric E-region irregularities linked with daytime scintillations. Derived spectral index ranges between −2 and −9. Assuming velocity of irregularities, the characteristic lengths of the E-region irregularities are estimated. We have estimated the minimum and maximum range of scale length of sporadic-E (E s ) irregularities to be observed over Varanasi. These results are in close agreement with those reported from this latitude region.
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