% The Homogenized aa indices - station scaling factors % % The station code number, its minimum angular distance to the nominal auroral oval (d), derived % from the IGRF-15 and gufm1 main field models, and the scalefactor s(d) for each year for: % the northern hemisphere aa station, % the southern hemisphere aa station, % and the Niemegk composite station % note that in the text of the paper d is denoted by a greek lower-case delta symbol % % column 1 year number % column 2 date % column 3 N hemisphere aa station code % column 4 angular distance d for N hemisphere aa station, d_N (degrees) % column 5 scalefactor for N hemisphere aa station, s(d)_N % column 6 S hemisphere aa station code % column 7 angular distance d for S hemisphere aa station, d_S (degrees) % column 8 scalefactor for S hemisphere aa station, s(d)_S % column 9 Niemegk composite station code % column 10 angular distance d for Niemegk composite station, d_NGK (degrees) % column 11 scalefactor for Niemegk composite station, s(d)_NGK % % station codes are 1 = Greenwich, 2 = Melbourne, 3 = Abinger, 4 = Toolangi, 5 = Hartland % 6 = Canberra, 7 = Potsdam, 8 = Seddin, 9 = Niemegk % % missing data for station code = 999 % missing data for d and s(d) = 999.0000 % % Please cite: % Lockwood, M., A. Chambodut, L.A. Barnard, M.J. Owens, and E. Clarke (2018) % A homogeneous aa index: 1. Secular variation % J. Space Weather & Space Climate, 2018 % % data fields % Date ---Northern Hemisphere aa Station--- ---Southern hemisphere aa station---- -----Niemegk data composite station------ % 1 2 3 4 5 6 7 8 9 10 11 % # date station d_N s(d)_N station d_S s(d)_S station d_NGK s(d)_NGK 1 1868.5 1 16.9457 1.101727 2 20.3733 0.942019 999 999.0000 999.000000 2 1869.5 1 16.9751 1.100065 2 20.3863 0.941525 999 999.0000 999.000000 3 1870.5 1 17.0040 1.098439 2 20.3967 0.941129 999 999.0000 999.000000 4 1871.5 1 17.0330 1.096812 2 20.4058 0.940783 999 999.0000 999.000000 5 1872.5 1 17.0622 1.095180 2 20.4146 0.940452 999 999.0000 999.000000 6 1873.5 1 17.0906 1.093600 2 20.4220 0.940171 999 999.0000 999.000000 7 1874.5 1 17.1171 1.092127 2 20.4272 0.939977 999 999.0000 999.000000 8 1875.5 1 17.1407 1.090817 2 20.4291 0.939904 999 999.0000 999.000000 9 1876.5 1 17.1618 1.089653 2 20.4273 0.939975 999 999.0000 999.000000 10 1877.5 1 17.1813 1.088577 2 20.4221 0.940170 999 999.0000 999.000000 11 1878.5 1 17.1994 1.087581 2 20.4144 0.940461 999 999.0000 999.000000 12 1879.5 1 17.2163 1.086658 2 20.4048 0.940821 999 999.0000 999.000000 13 1880.5 1 17.2319 1.085800 2 20.3942 0.941224 999 999.0000 999.000000 14 1881.5 1 17.2462 1.085022 2 20.3787 0.941812 999 999.0000 999.000000 15 1882.5 1 17.2591 1.084318 2 20.3558 0.942682 999 999.0000 999.000000 16 1883.5 1 17.2713 1.083651 2 20.3281 0.943740 999 999.0000 999.000000 17 1884.5 1 17.2836 1.082984 2 20.2979 0.944892 999 999.0000 999.000000 18 1885.5 1 17.2965 1.082280 2 20.2679 0.946042 999 999.0000 999.000000 19 1886.5 1 17.3096 1.081570 2 20.2352 0.947303 999 999.0000 999.000000 20 1887.5 1 17.3224 1.080878 2 20.1977 0.948751 999 999.0000 999.000000 21 1888.5 1 17.3357 1.080157 2 20.1595 0.950234 999 999.0000 999.000000 22 1889.5 1 17.3505 1.079359 2 20.1244 0.951600 999 999.0000 999.000000 23 1890.5 1 17.3676 1.078435 2 20.0963 0.952698 7 19.4061 0.980835 24 1891.5 1 17.3896 1.077254 2 20.0760 0.953495 7 19.3986 0.981155 25 1892.5 1 17.4166 1.075807 2 20.0598 0.954132 7 19.3902 0.981512 26 1893.5 1 17.4461 1.074233 2 20.0449 0.954718 7 19.3806 0.981919 27 1894.5 1 17.4754 1.072670 2 20.0285 0.955362 7 19.3696 0.982386 28 1895.5 1 17.5020 1.071257 2 20.0080 0.956176 7 19.3569 0.982926 29 1896.5 1 17.5263 1.069972 2 19.9792 0.957317 7 19.3368 0.983790 30 1897.5 1 17.5501 1.068718 2 19.9430 0.958761 7 19.3083 0.985009 31 1898.5 1 17.5728 1.067520 2 19.9033 0.960347 7 19.2790 0.986271 32 1899.5 1 17.5941 1.066401 2 19.8642 0.961913 7 19.2560 0.987259 33 1900.5 1 17.6135 1.065388 2 19.8299 0.963295 7 19.2467 0.987658 34 1901.5 1 17.6308 1.064484 2 19.8009 0.964469 7 19.2500 0.987514 35 1902.5 1 17.6466 1.063658 2 19.7742 0.965551 7 19.2585 0.987151 36 1903.5 1 17.6615 1.062884 2 19.7486 0.966592 7 19.2696 0.986670 37 1904.5 1 17.6760 1.062133 2 19.7228 0.967645 7 19.2812 0.986171 38 1905.5 1 17.6905 1.061379 2 19.6956 0.968761 7 19.2908 0.985758 39 1906.5 1 17.7060 1.060576 2 19.6667 0.969948 7 19.2995 0.985384 40 1907.5 1 17.7221 1.059743 2 19.6370 0.971174 7 19.3089 0.984980 41 1908.5 1 17.7376 1.058945 2 19.6066 0.972429 8 19.3175 0.984612 42 1909.5 1 17.7511 1.058247 2 19.5759 0.973706 8 19.3238 0.984343 43 1910.5 1 17.7615 1.057714 2 19.5449 0.974996 8 19.3262 0.984239 44 1911.5 1 17.7699 1.057282 2 19.5136 0.976307 8 19.3247 0.984303 45 1912.5 1 17.7779 1.056873 2 19.4817 0.977644 8 19.3207 0.984476 46 1913.5 1 17.7846 1.056528 2 19.4495 0.978999 8 19.3148 0.984727 47 1914.5 1 17.7893 1.056289 2 19.4173 0.980359 8 19.3078 0.985028 48 1915.5 1 17.7910 1.056200 2 19.3854 0.981714 8 19.3003 0.985350 49 1916.5 1 17.7898 1.056263 2 19.3536 0.983070 8 19.2905 0.985772 50 1917.5 1 17.7868 1.056417 2 19.3217 0.984434 8 19.2771 0.986347 51 1918.5 1 17.7830 1.056610 2 19.2899 0.985798 8 19.2618 0.987005 52 1919.5 1 17.7795 1.056789 2 19.2584 0.987153 8 19.2463 0.987676 53 1920.5 1 17.7773 1.056903 4 19.5748 0.973750 8 19.2321 0.988289 54 1921.5 1 17.7763 1.056956 4 19.5436 0.975050 8 19.2194 0.988839 55 1922.5 1 17.7755 1.056994 4 19.5124 0.976355 8 19.2071 0.989374 56 1923.5 1 17.7749 1.057026 4 19.4814 0.977655 8 19.1949 0.989902 57 1924.5 1 17.7742 1.057061 4 19.4509 0.978939 8 19.1828 0.990430 58 1925.5 1 17.7733 1.057108 4 19.4212 0.980196 8 19.1704 0.990969 59 1926.5 3 17.9859 1.046330 4 19.3920 0.981436 8 19.1575 0.991532 60 1927.5 3 17.9840 1.046426 4 19.3630 0.982667 8 19.1441 0.992116 61 1928.5 3 17.9819 1.046532 4 19.3347 0.983876 8 19.1309 0.992696 62 1929.5 3 17.9799 1.046632 4 19.3074 0.985047 8 19.1183 0.993247 63 1930.5 3 17.9784 1.046707 4 19.2813 0.986166 8 19.1069 0.993746 64 1931.5 3 17.9772 1.046765 4 19.2566 0.987229 9 19.0967 0.994193 65 1932.5 3 17.9761 1.046822 4 19.2331 0.988248 9 19.0873 0.994608 66 1933.5 3 17.9751 1.046871 4 19.2103 0.989235 9 19.0784 0.995000 67 1934.5 3 17.9745 1.046905 4 19.1879 0.990205 9 19.0699 0.995376 68 1935.5 3 17.9742 1.046917 4 19.1658 0.991169 9 19.0615 0.995745 69 1936.5 3 17.9743 1.046910 4 19.1444 0.992104 9 19.0530 0.996119 70 1937.5 3 17.9747 1.046891 4 19.1238 0.993003 9 19.0445 0.996495 71 1938.5 3 17.9753 1.046860 4 19.1034 0.993900 9 19.0364 0.996854 72 1939.5 3 17.9761 1.046820 4 19.0822 0.994833 9 19.0291 0.997178 73 1940.5 3 17.9771 1.046772 4 19.0594 0.995838 9 19.0230 0.997448 74 1941.5 3 17.9791 1.046671 4 19.0334 0.996987 9 19.0174 0.997694 75 1942.5 3 17.9828 1.046484 4 19.0047 0.998263 9 19.0119 0.997939 76 1943.5 3 17.9879 1.046232 4 18.9754 0.999568 9 19.0071 0.998151 77 1944.5 3 17.9939 1.045932 4 18.9477 1.000804 9 19.0038 0.998301 78 1945.5 3 18.0004 1.045606 4 18.9238 1.001872 9 19.0025 0.998358 79 1946.5 3 18.0088 1.045187 4 18.9040 1.002760 9 19.0030 0.998335 80 1947.5 3 18.0199 1.044631 4 18.8864 1.003551 9 19.0044 0.998273 81 1948.5 3 18.0328 1.043992 4 18.8700 1.004291 9 19.0065 0.998181 82 1949.5 3 18.0462 1.043325 4 18.8538 1.005025 9 19.0090 0.998068 83 1950.5 3 18.0591 1.042683 4 18.8367 1.005798 9 19.0118 0.997945 84 1951.5 3 18.0713 1.042079 4 18.8184 1.006629 9 19.0155 0.997780 85 1952.5 3 18.0834 1.041479 4 18.7995 1.007489 9 19.0207 0.997550 86 1953.5 3 18.0959 1.040858 4 18.7806 1.008349 9 19.0270 0.997271 87 1954.5 3 18.1094 1.040196 4 18.7624 1.009181 9 19.0340 0.996961 88 1955.5 3 18.1241 1.039469 4 18.7454 1.009957 9 19.0413 0.996637 89 1956.5 3 18.1412 1.038627 4 18.7296 1.010681 9 19.0494 0.996281 90 1957.5 5 17.7056 1.060597 4 18.7144 1.011377 9 19.0586 0.995873 91 1958.5 5 17.7315 1.059260 4 18.7000 1.012043 9 19.0687 0.995429 92 1959.5 5 17.7571 1.057942 4 18.6862 1.012676 9 19.0791 0.994968 93 1960.5 5 17.7805 1.056739 4 18.6732 1.013277 9 19.0896 0.994507 94 1961.5 5 17.8013 1.055673 4 18.6613 1.013826 9 19.1001 0.994044 95 1962.5 5 17.8208 1.054677 4 18.6505 1.014327 9 19.1109 0.993569 96 1963.5 5 17.8398 1.053709 4 18.6400 1.014814 9 19.1221 0.993079 97 1964.5 5 17.8591 1.052726 4 18.6291 1.015321 9 19.1336 0.992575 98 1965.5 5 17.8796 1.051686 4 18.6170 1.015881 9 19.1455 0.992055 99 1966.5 5 17.9013 1.050585 4 18.6032 1.016523 9 19.1578 0.991516 100 1967.5 5 17.9238 1.049450 4 18.5881 1.017229 9 19.1707 0.990957 101 1968.5 5 17.9470 1.048283 4 18.5723 1.017966 9 19.1839 0.990382 102 1969.5 5 17.9708 1.047086 4 18.5566 1.018698 9 19.1974 0.989796 103 1970.5 5 17.9953 1.045861 4 18.5418 1.019392 9 19.2110 0.989203 104 1971.5 5 18.0210 1.044579 4 18.5281 1.020034 9 19.2262 0.988543 105 1972.5 5 18.0479 1.043238 4 18.5151 1.020646 9 19.2432 0.987812 106 1973.5 5 18.0754 1.041877 4 18.5022 1.021253 9 19.2596 0.987100 107 1974.5 5 18.1024 1.040538 4 18.4890 1.021875 9 19.2735 0.986501 108 1975.5 5 18.1283 1.039262 4 18.4750 1.022537 9 19.2827 0.986106 109 1976.5 5 18.1534 1.038031 4 18.4588 1.023305 9 19.2886 0.985851 110 1977.5 5 18.1782 1.036813 4 18.4406 1.024166 9 19.2939 0.985623 111 1978.5 5 18.2023 1.035635 4 18.4226 1.025025 9 19.2982 0.985440 112 1979.5 5 18.2251 1.034523 4 18.4066 1.025783 9 19.3011 0.985317 113 1980.5 5 18.2461 1.033503 6 21.1025 1.017156 9 19.3021 0.985272 114 1981.5 5 18.2654 1.032565 6 21.0929 1.017529 9 19.3005 0.985341 115 1982.5 5 18.2837 1.031681 6 21.0835 1.017894 9 19.2965 0.985514 116 1983.5 5 18.3009 1.030850 6 21.0755 1.018208 9 19.2912 0.985739 117 1984.5 5 18.3171 1.030071 6 21.0698 1.018428 9 19.2859 0.985968 118 1985.5 5 18.3322 1.029344 6 21.0677 1.018511 9 19.2817 0.986149 119 1986.5 5 18.3459 1.028685 6 21.0692 1.018453 9 19.2785 0.986286 120 1987.5 5 18.3583 1.028090 6 21.0731 1.018299 9 19.2755 0.986416 121 1988.5 5 18.3702 1.027519 6 21.0788 1.018078 9 19.2727 0.986535 122 1989.5 5 18.3824 1.026936 6 21.0855 1.017818 9 19.2703 0.986642 123 1990.5 5 18.3957 1.026303 6 21.0924 1.017548 9 19.2681 0.986735 124 1991.5 5 18.4106 1.025594 6 21.1004 1.017237 9 19.2665 0.986806 125 1992.5 5 18.4266 1.024832 6 21.1104 1.016848 9 19.2652 0.986859 126 1993.5 5 18.4431 1.024050 6 21.1219 1.016402 9 19.2640 0.986911 127 1994.5 5 18.4593 1.023282 6 21.1344 1.015918 9 19.2625 0.986975 128 1995.5 5 18.4745 1.022561 6 21.1473 1.015418 9 19.2604 0.987067 129 1996.5 5 18.4888 1.021888 6 21.1613 1.014877 9 19.2559 0.987261 130 1997.5 5 18.5025 1.021239 6 21.1769 1.014274 9 19.2485 0.987582 131 1998.5 5 18.5159 1.020609 6 21.1935 1.013637 9 19.2394 0.987973 132 1999.5 5 18.5290 1.019995 6 21.2101 1.012997 9 19.2301 0.988374 133 2000.5 5 18.5418 1.019392 6 21.2262 1.012380 9 19.2220 0.988726 134 2001.5 5 18.5538 1.018830 6 21.2411 1.011808 9 19.2145 0.989053 135 2002.5 5 18.5649 1.018310 6 21.2554 1.011261 9 19.2066 0.989393 136 2003.5 5 18.5761 1.017787 6 21.2699 1.010709 9 19.1992 0.989714 137 2004.5 5 18.5883 1.017219 6 21.2853 1.010121 9 19.1930 0.989983 138 2005.5 5 18.6024 1.016560 6 21.3025 1.009467 9 19.1888 0.990167 139 2006.5 5 18.6200 1.015743 6 21.3224 1.008710 9 19.1863 0.990276 140 2007.5 5 18.6409 1.014774 6 21.3448 1.007861 9 19.1845 0.990353 141 2008.5 5 18.6636 1.013723 6 21.3688 1.006954 9 19.1830 0.990419 142 2009.5 5 18.6866 1.012659 6 21.3935 1.006025 9 19.1814 0.990491 143 2010.5 5 18.7085 1.011650 6 21.4178 1.005110 9 19.1791 0.990590 144 2011.5 5 18.7291 1.010706 6 21.4420 1.004202 9 19.1754 0.990750 145 2012.5 5 18.7493 1.009779 6 21.4668 1.003277 9 19.1704 0.990968 146 2013.5 5 18.7694 1.008857 6 21.4918 1.002344 9 19.1650 0.991205 147 2014.5 5 18.7898 1.007929 6 21.5168 1.001413 9 19.1600 0.991420 148 2015.5 5 18.8106 1.006982 6 21.5416 1.000494 9 19.1565 0.991575 149 2016.5 5 18.8319 1.006017 6 21.5662 0.999585 9 19.1540 0.991683 150 2017.5 5 18.8535 1.005039 6 21.5907 0.998681 9 19.1518 0.991782