Oulujärvi   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 
 
2021 12  1	  15  12  19    25  10  12     9  12  15    15   9  15    20  20  22    26  21  11    35  33  56    46  15  33 
2021 12  2	   8   4   3     3   4   3     7  10   8     6   3   3     4   5   5     8   7   5    13   5  12    10   5   4 
2021 12  3	   4   2   5     5   2   9     1   6   6     9   3   8     6   7   7    17   8  14    45  14  68     6   2   2 
2021 12  4	   5  10  14    11   6   5     4   7   4     7   7   5     4   3   5     3   4   4     3  17   5     2   5   4