Ionospheric Disturbances during X1.5 Class Solar Flare of 3 July 2021

Abstract

An X1.5 solar flare occurred from solar active region 12838 at 1418 UT on 3 July 2021 and its X ray intensity peaked up at ~ 1429 UT. Besides its location at limb side i.e. ~ 24°N, 88°W, it had strong effects in the ionosphere. GPS observations reveal an increase of TEC with 15–30 minutes delay. A shortwave radio blackout (R3 - Strong Radio Blackout) over the Atlantic Ocean has also been observed during this flare that sustained for an hour after the flare peak time.