Ivalo 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 68 78 76 79 19 36 34 43 25 56 55 98 58 88 86 55 28 149 160 30 70 59 96 69 2023 12 2 92 68 31 53 33 20 36 12 7 7 7 10 12 6 4 13 17 7 4 6 7 13 5 10