Daytime equatorial VHF radiowave scintillations and sporadic-E layer

Abstract

Daytime VHF radiowave scintillations at Trivandrum are compared with the E-region irregularities at Kodaikanal. It is shown that daytime scintillations at Trivandrum are basically of two categories. One type of scintillations is associated with the q type of sporadic-E occurrence during normal electrojet condition and is weak with peak-to-peak fluctuations of 1-2 dB. The other type of scintillations is associated with blanketing type of sporadic-E occurrence during counter electrojet condition with magnitude greater than 5 dB.