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The spread-F and scintillation observations made at ten Indian stations covering 8 to 25°N geographic latitudes during the equinoctial month of September 1991 are used to study the occurrence characteristics of ionospheric irregularities and their association with the changes in the virtual height of the F layer at an equatorial station, Trivandrum (0.3° S dip). No event of scintillation occurrence...
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