Stanford Mean Solar Magnetic Field (microTesla) 2001 Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. day 1 -18 -9 45 2 -49 -39 -10 0 -23 12 -10 . 2 -45 -16 . -7 -36 -10 -37 -2 -20 19 -28 . 3 -51 9 . -29 -38 18 -39 -25 -7 25 -54 . 4 -18 0 . -49 -29 21 -5 -10 13 23 -46 4 5 42 -13 . -29 -13 -12 7 0 32 32 -20 . 6 54 -2 . . -2 -28 3 7 30 -3 -19 . 7 . . -29 -33 20 -16 8 30 66 -29 21 -10 8 . -78 -16 -16 18 28 -3 43 88 -40 58 65 9 . . -36 -16 22 25 0 86 55 -36 94 80 10 . . -33 0 4 -18 2 81 11 -11 12 105 11 . . -16 . -2 -41 22 93 26 23 32 110 12 . . -7 -13 -20 -28 57 124 14 -4 . 60 13 . . -16 -18 2 9 70 50 22 -12 . 31 14 16 -42 -22 -16 7 39 82 -5 30 -29 9 49 15 -4 -33 -159 -20 -15 76 59 -20 23 -18 53 12 16 -16 -40 -16 -11 -5 79 . -38 1 -18 . . 17 -31 . -13 0 23 39 28 -41 -17 7 37 . 18 -18 . -22 33 77 14 -2 -20 -17 -3 47 -30 19 -38 . -2 . 94 -1 -13 -12 -32 -3 . -20 20 . . 22 . 104 23 -23 -17 -34 -8 . . 21 . . 63 33 61 . -26 -17 19 19 . . 22 4 . 67 69 38 . -23 -29 28 36 16 . 23 . 51 47 65 32 . -12 -30 28 47 -46 -42 24 . . . 58 34 15 -26 -13 15 41 . -21 25 . . . 42 -14 -15 -25 -6 75 1 . . 26 83 4 51 33 -41 3 -41 14 62 -21 -4 -107 27 45 20 33 36 -60 -104 -41 20 30 -79 7 . 28 16 27 40 7 -56 . -17 22 -10 . . . 29 11 22 -31 -43 0 -40 . -10 . -15 . 30 -45 27 -54 -52 -55 -12 33 -7 -32 -37 . 31 -25 20 -55 -12 3 9 -68