Fig. 8From: Occurrence of F region echoes for the polar cap SuperDARN radarsa Line plots of the echo occurrence rate in percent (15-min values averaged over the entire month) versus time of a day in May 2015 for the Inuvik (INV) and CLY radars and the electron density at the F region peak as inferred from Rankin Inlet (RKN) elevation angle data (purple line) and the E × B plasma flow magnitude (black line) in the area of joint RKN–INV–CLY observations. Nighttime RKN data on the electron density are not considered. b Correlation coefficients between diurnal variations of the INV and CLY echo occurrence rate and the electron density at the F region peak. c Correlation coefficients between diurnal variations of the INV and CLY echo occurrence rate and the E × B magnitudeBack to article page