Fig. 6From: Dependence of the high-latitude plasma irregularities on the auroral activity indices: a case study of 17 March 2015 geomagnetic stormScatter plot of the normalized HROTI data versus HP, AE, and Kp indices. Left panel (a–c) shows results for HROTI calculated over the region of 50–90° MLAT, right panel (d–f)—over the region of 50–75° MLAT. Data are averaged over a 15-min period. The red solid line is the best fit line. The correlation and linear regression coefficients are shown at the top of each graphBack to article page