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(The monthly data in the wdc-like format is here.)

                                      WDC for Geomagnetism, Kyoto
                                Hourly Equatorial Dst Values (FINAL)      
                                          SEPTEMBER   2008
      unit=nT                                                                                      UT
      1   2   3   4   5   6   7   8    9  10  11  12  13  14  15  16   17  18  19  20  21  22  23  24
DAY
 1    4   5   5   2   1   1   3   4    3   3   2   2   3   6   8   7    4   0  -4  -5  -2   2   4   6
 2    9  10   5   0  -1  -1   0   0   -2  -4  -7 -10  -7  -3  -1  -2   -2  -3  -5  -3   0  -1  -2  -1
 3    0   4   5   5   7  15  19  14   10   1   2  -1  -3  -1   4   9   19   9   5   8  11  15  13  11
 4    5 -10 -29 -47 -51 -41 -32 -29  -20 -16 -13 -22 -31 -26 -31 -33  -27 -26 -25 -26 -27 -27 -25 -23
 5  -20 -21 -24 -28 -29 -28 -23 -22  -20 -17 -17 -15 -18 -18 -15 -14  -14 -16 -18 -19 -16 -13  -9  -7

 6   -9 -17 -16 -14 -12 -11 -10  -8   -6  -6  -7  -8 -11 -12 -10  -7   -7  -5  -9 -11 -10  -9  -6  -5
 7   -5  -8 -10 -11  -9  -7  -5  -5   -5  -5  -5  -7 -11 -11 -11 -10   -7  -5 -12  -8  -4  -2  -4  -5
 8   -4  -3  -4  -6  -7 -11  -8  -6   -9 -13 -11 -11 -14 -10 -10 -11   -9 -10 -15 -16 -14 -11  -9 -10
 9   -9  -7  -7  -7  -9  -9  -6  -3   -6  -7  -8  -9 -10  -8  -6  -7   -9  -8  -7  -5  -4  -6 -11 -10
10   -6  -2  -1  -3  -3  -3  -2  -4   -5  -6  -9 -11  -9 -10  -9  -6   -6  -8  -8  -8  -6  -8  -9  -9

11   -9  -9  -9 -10  -9  -5  -3  -3   -5  -4  -5  -9  -9  -7  -5  -2    0   0  -4  -5  -5  -5  -9 -10
12   -7  -4  -3  -5  -6  -6  -7  -6   -4  -5  -6  -7  -8  -9  -9 -10   -9  -9  -9 -10  -9  -9  -8  -5
13    0   1   2   2   1   3   5   4    5   5   5   3   1   0  -1  -1    1   4   4   4   3   2   2   4
14    6   7   9   9   7   6   6   6    5   5   3  -1  -3  -1   1   3    3   2   0   6   5  10   6  -4
15   -8  -6  -2   3   1   3   0   1   -9  -6 -19 -30 -30 -22 -20 -22  -22 -25 -25 -27 -27 -21 -18 -13

16  -10  -8  -7  -6 -11 -15 -19 -23  -22 -17 -18 -20 -20 -19 -18 -17  -17 -19 -17 -19 -21 -22 -22 -21
17  -19 -15 -15 -16 -19 -20 -19 -17  -14 -11  -8  -9 -10  -8  -5  -4   -3  -4  -5  -4  -4  -5  -8  -7
18   -8  -7 -10 -11 -13 -15 -18 -23  -22 -25 -30 -31 -30 -27 -22 -19  -16 -15 -14 -14 -14 -16 -18 -17
19  -13 -12 -12  -9  -7  -6  -6  -9  -10 -12 -16 -19 -17 -12  -5   0   -1  -2  -5  -7 -11 -12 -10  -8
20   -8  -9 -11  -8  -5  -3  -4  -4   -5  -6  -6  -8  -6  -4  -2   2    4   4   4   4   2   2   1   0

21    0  -3  -2   1   2   2   3   2    3   4   3   2   2   2   3   3    3   1  -1  -1  -1  -1  -6 -12
22  -19 -24 -20 -15  -8  -6  -7  -8   -7  -5  -3  -2  -1   0   1   1    1   0  -2  -3  -2  -4  -4  -4
23   -3  -2  -1  -1   0   0   0  -1   -1   0   2   2   0   0  -1  -2   -2  -3  -2  -4  -7  -9  -9  -5
24    0   3   4   3  -1  -3  -2   0    2   0  -2  -1   1   3   4   2   -2  -3  -3  -1   0   2   3   1
25    5   4   3   3   5   6   6   5    6   5   6   6   9  11  10   9   11  12  10   3  -6  -9  -8  -5

26   -2  -4  -5  -5  -3  -2  -3  -3   -3  -3  -1  -2  -2   0   0  -3   -3  -2  -1   2   4   5   5   5
27    5   5   4   4   4   5   3   3    2   1   1   3  10  10   9   8    6   6   2  -2  -4  -7  -8  -4
28   -2   0   0   2   3   1   0   0    0   3   2   1   1   0  -3  -1   -1   2   6   9   8   4   3   3
29    4   5   6   6   6   4   2  -3   -7  -7  -1   0  -2  -3  -4  -3   -1   0   0  -1  -2  -4  -3  -3
30   -4  -4  -1   0   3   5   6   4    3   2   3   5   7  10   9   9   12  11  14  14  13   4  -1  -4