Fig. (3) Diurnal variations of global geomagnetic indices, ionospheric characteristics, GOES X-ray flux and vTEC for 6 (left) and 10 (right) September 2017. (a) kp. (b) Dst. (c) NmF2 and (d) h’F/F2 for La Serena (LS, 29°52'S; 71°15’W). (e) fmin for LS, Jicamarca (JI, 11°57’S; 78°52’W) and Tucuman (TU, 26°50’; 65°14’W). (f) GOES solar X-ray flux and (g) vTEC for LS. Open circles, black filled circles and a black line are for LS; black filled circles are for those values scaled as “doubtful” according to international accepted rules [34]. Red lines are for smoothed median values plus interquartile range and blue lines are for the median minus interquartile range for 17 quiet days. fmin at JI and TU are shown in magenta dots and green dots, respectively.