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

                                      WDC for Geomagnetism, Kyoto
                                Hourly Equatorial Dst Values (FINAL)      
                                          SEPTEMBER   2010
      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    1   3   2   1   2   2   0  -2    0   2   3   5   5   3   6   3    8   2   0  -5  -6  -7  -4  -4
 2  -10  -7  -5  -2  -2  -1  -5  -9  -14 -13 -13 -10  -9  -8 -10 -12   -8 -10 -10 -13 -14 -12 -11 -13
 3  -14 -15 -14 -13 -12 -11 -10 -11  -11 -11 -10  -7  -8 -10 -11 -11  -11 -12 -13 -14 -14 -12 -11 -11
 4  -10  -9 -10  -9  -8  -6  -5  -5   -6  -7  -6  -5  -3  -3  -4  -4   -3  -4  -3  -4  -5  -6  -5  -3
 5    0   1   0  -2  -5  -7  -5  -5   -8  -9  -7  -3  -5  -6  -6  -4   -1   0   1   3   3   3   3  -7

 6  -16 -14 -11  -8 -10  -7  -9 -13  -12 -12 -12 -11  -9  -7  -8 -10  -14 -15 -13  -8  -8  -7  -8  -8
 7   -8 -12 -12 -10 -13 -14 -15 -12  -11 -14 -17 -18 -15 -11 -10 -10   -9 -11  -7  -4  -5  -1  -3  -1
 8   -6 -14 -16 -15 -15 -12  -7  -5   -4  -8 -11 -13 -13 -22 -29 -27  -30 -36 -38 -38 -35 -31 -27 -23
 9  -18 -12 -15 -15 -13 -14 -16 -17  -17 -16 -11 -11 -11 -10  -8 -11   -9 -10  -9  -9  -7  -9  -8  -8
10  -10 -13 -14 -10 -11 -10  -9 -10  -11 -11 -10 -10 -11  -9  -7  -6   -6  -5  -4  -3  -2  -3  -5  -7

11   -9  -9  -6  -4  -3  -3  -1  -2   -3  -6  -6  -6  -7  -7  -7  -6   -6  -8  -9  -8  -5  -4  -4  -5
12   -5  -6  -6  -5  -4  -4  -5  -4   -3  -2  -1  -4  -7  -7  -5  -3   -2  -2  -4  -4  -2   0   1  -1
13   -2  -3  -3  -1   0   0   3   3    0  -2  -2  -4  -4  -1  -1   3    2   2   1  -1   0   2   3   4
14    2   3  -2  -4  -7 -13 -16 -22  -21 -12  -4   3   5   2   1   2   -8 -14 -10 -14 -14 -15 -19 -25
15  -25 -24 -23 -21 -20 -19 -21 -23  -22 -14 -14  -4  -7  -6  -5  -4   -4  -4  -6  -7  -6  -5  -8  -9

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

21    8   3  -3  -3  -8 -10 -16 -16  -15 -12  -8  -7  -4  -4  -4 -13  -13 -13 -10 -10  -8  -5  -4  -4
22   -3   2   5   4   1  -2  -4  -4   -3  -2  -2  -2  -2  -4  -7  -9   -8  -6  -3  -2  -5   0   3   5
23    3   4   5   9   8  10  12   7    6   7   4   5   7   6  13  19   16   7   1   1   4   5   2   0
24    1   4   5  -2   4  -1 -14 -25  -29 -32 -20 -13 -15 -16 -14 -17  -13 -11 -15 -12 -14 -16 -17 -20
25  -18 -16 -16 -16 -17 -18 -17 -17  -16 -13 -12 -10  -8  -3   1   2   -2  -8 -10 -12 -11 -10  -9  -8

26   -7 -11 -11 -12 -14 -14 -16 -14  -15 -14 -12 -10  -7   0  -1  -7   -9  -9 -14 -15 -19 -17 -19 -20
27  -18 -15 -13 -12  -9  -7  -8  -8   -6  -5  -3  -2  -1  -2   0  -5  -12 -12 -12 -15 -18 -17 -19 -20
28  -19 -19 -17 -16 -14 -11  -8  -8  -24 -27 -19 -14 -13 -14 -15 -15  -14 -10 -10 -11 -13 -10 -10 -12
29  -13 -14 -14 -15 -21 -24 -23 -20  -18 -18 -18 -18 -16 -15 -16 -16  -15 -11  -9  -9  -8  -7  -8  -8
30  -11 -12 -12 -14 -13 -11 -10 -10   -9  -8  -7  -8  -5  -1  -1  -2   -3  -1  -1  -3  -6  -6  -6  -4