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<p><strong>Abstract.</strong> In this paper, we present seasonal variation of E region field-aligned irregularities (FAIs) observed using the Gadanki radar and compare them with the seasonal variation of <I>E<sub>s</sub></I> observed from a nearby location SHAR. During daytime, FAIs occur maximum in summer and throughout the day, as compared to other seasons. During nighttime, FAIs occur equally in both summer and winter, and relatively less in equinoxes. Seasonal variations ofdoi:10.5194/angeo-26-1865-2008 fatcat:nwobhb6kqzaatarb6w5egxvnci