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

                                      WDC for Geomagnetism, Kyoto
                                Hourly Equatorial Dst Values (FINAL)      
                                          SEPTEMBER   2012
      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   14  16  18  17  17  12  10  11   11   4   0  -8 -13 -13 -12 -11   -9  -5   2   6   9   9  10   6
 2   -2  -8 -11 -11 -12 -20 -27 -29  -26 -22 -17 -22 -25 -29 -33 -36  -41 -47 -47 -39 -35 -41 -42 -45
 3  -47 -48 -49 -50 -57 -63 -65 -65  -62 -66 -69 -63 -38 -44 -52 -56  -53 -51 -52 -61 -57 -43 -48 -45
 4  -33 -31 -40 -46 -42 -48 -58 -59  -54 -42 -34 -32 -39 -34 -31 -22  -17 -22 -25 -27 -30 -30 -28 -27
 5  -34 -39 -45 -41 -45 -64 -55 -63  -61 -43 -37 -35 -35 -41 -38 -32  -34 -20 -22 -33 -33 -27 -19 -10

 6  -12 -13 -16 -32 -26 -30 -30 -28  -25 -22 -23 -27 -27 -26 -24 -25  -17 -10 -13 -20 -25 -25 -24 -23
 7  -20 -17 -11 -17 -23 -24 -20 -22  -27 -30 -28 -28 -29 -30 -27 -28  -27 -29 -32 -30 -30 -25 -27 -32
 8  -35 -31 -28 -26 -30 -31 -28 -21  -17 -20 -23 -24 -26 -28 -27 -22  -20 -22 -24 -23 -21 -18 -16 -17
 9  -17 -13  -8  -5  -5  -8 -10 -11  -11 -10  -9  -9 -10  -8  -9 -11  -13 -14 -13 -12 -12  -9  -6  -7
10  -11 -12  -6  -1  -2  -1  -1  -1    2   2   2   3   5   1   8   4   -4  -6  -1   2   1  -1  -1   0

11    2   3   6   9  10   7   4   2    3   2   0   1   2   1  -1  -4   -4  -6  -7  -7  -6  -5  -4  -2
12    0   3   2   2   3  -1  -1   3    5   4   2   3   1   3   6   7    7   6   9  12  11  15  13  11
13    6   3   6   8   8   1  -4  -1    1   0   0   0   0  -1  -2  -2    0  -3  -5  -4  -3  -3  -1   1
14    3   6   9  11   9   7   4   4    7   9  10  12  13  11   9   8    7   6   4   1   0   0   0  -8
15  -12  -8  -1   4   6   1  -2  -6   -9  -6  -4  -3  -3  -2  -2   1    3   0  -4  -6  -6  -4  -3   0

16    2   6   5   2   0  -1  -5  -6   -9  -8 -12  -9  -6  -4  -4   0    3   1  -5  -1  -6  -1  -1  -1
17    0   6   9  11  10   7   5   5    7   4   2   3   2   2   3   2    4   4   3   2   1   1   2   3
18    5   8   4   4   2  -4 -10 -14  -11 -11 -11 -15 -15 -11  -9  -5   -7  -3  -1   0   1   1   3   4
19    4   5   8   7   2  -4  -5  -4   -4  -4  -2   0  -4  -7  -6   1   -2 -11 -11  -7 -19 -31 -36 -25
20  -17 -23 -16 -13 -11  -9  -3   1   -5 -13 -12 -17 -17 -18 -15 -13  -15 -14 -14 -11 -11 -11 -13 -15

21  -15 -12 -11 -10 -10 -11  -6  -3   -3   1   0   2   0   0  -1  -1    0  -3  -4  -7  -7  -4  -3  -3
22   -7  -9  -9  -8  -7  -3  -2  -4   -6 -10  -6   0  -1  -3  -4  -5   -2  -1   1  -1  -1  -2   0   1
23    1   1   1   3   4   3   3   3    5   5   6   5   5   3   2   4    5   5   5   4   2  -1  -3  -4
24    0   2   5   5   5   6  10  12    9   7   8   9  11  12  13   9    7   6   9  11  13  10   7   3
25    1   1   0  -1  -1   1   5   4    4   5   5   3   3   2   1   2    5   6   3   0  -1   2   4   6

26    9  10  13  13  15  18  19  19   21  21  21  20  16  13   7  11   13  14  11   8  -5  -4  -4  -1
27    0  -1   2   2  -1  -2  -3  -1    0   3   2  -1  -1  -2  -4  -5   -3  -1  -2  -2  -4  -3   1   4
28    6   6   5   4   3   3   5   6    7   9   8   6   6   8  11  13   14  14  12  10   9  12  16  18
29   17  15  17  16  16  14  10  10   10   7   5   4   4   4   5   6    3  -2  -3  -3   0   1   1   1
30    5  10  13  12   9  10  10  11   10   9   8  15  20  24   5 -11  -20 -26 -31 -34 -39 -32 -30 -21