Mekrijärvi MAXIMUM TIME DERIVATIVE (0.01 nT/sec) OF HORIZONTAL COMPONENT (X,Y) Time (UT) 01...03 04...06 07...09 10...12 13...15 16...18 19...21 22...24 2023 12 1 25 13 12 8 8 7 5 6 4 46 24 105 129 129 48 29 15 144 93 26 130 113 44 26 2023 12 2 36 59 37 19 22 9 10 5 4 2 2 7 5 2 2 7 12 3 1 2 3 12 3 7