Stanford Mean Solar Magnetic Field (microTesla) 1985 Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. day 01 5 38 31 2 -5 -10 -16 -5 . 13 -7 . 02 14 35 27 -10 -8 -7 -14 1 . 15 -10 . 03 21 32 16 -14 -9 -11 -5 2 7 6 -8 . 04 38 30 13 -13 -5 -12 2 8 3 -6 -15 -16 05 . 15 . -17 -5 -11 5 11 5 -13 -16 -20 06 . . . -20 -5 -3 17 6 3 . -25 -25 07 37 . -8 -7 -8 4 31 10 . -20 -26 . 08 26 . -17 -13 -8 6 24 . . -23 . . 09 . -4 -13 -6 -5 -1 22 8 -26 -26 -17 -14 10 6 -5 . -13 4 -4 . 8 -24 -27 . 1 11 -10 -1 -4 -29 2 3 12 -9 -24 -21 -6 13 12 -8 -2 -1 -19 8 12 7 -16 -22 -23 -5 8 13 -10 -8 -3 -21 1 22 5 -23 -25 -16 5 3 14 -1 -9 -15 -13 . 21 8 -28 -24 -26 11 . 15 1 -23 -12 -12 . 19 6 -22 -21 -20 6 . 16 -7 -17 -6 . 11 17 -10 -23 -21 -27 . -18 17 -3 -13 10 3 22 13 -27 -22 -25 -21 -3 -20 18 -25 . . -7 33 15 -27 -20 -29 -25 -2 -21 19 -35 -12 -7 -10 48 7 -24 -20 -28 . -11 3 20 . -17 -6 . 39 -10 . -17 -22 . . 11 21 . -15 -12 5 27 -21 . -19 -21 -17 -5 15 22 -30 -12 -12 6 25 -16 -19 -22 -23 -17 . 22 23 . -7 -5 18 0 -13 -19 -18 -16 -12 . 28 24 . -6 . 23 -9 -13 -10 -22 -10 -8 . 15 25 -9 2 1 18 -21 -16 -14 -28 -6 . . 21 26 -12 -6 . 1 . -12 -19 -25 -5 4 15 8 27 -2 13 . -12 -18 -12 -27 -15 . 19 . . 28 32 20 37 -27 -8 -9 -26 -9 11 17 . . 29 0 24 -32 -8 -13 -27 -4 12 14 . . 30 19 16 -47 -9 -9 -25 -2 -6 16 -8 . 31 28 12 -5 -22 1 5 .