GEOMAGNETIC SUDDEN STORM COMMENCEMENTS 1868-1967 Format for STORM.SSC data (Mayaud Sudden Commencement data 1868-1967): Data are from IAGA Bulletin No. 33 (Mayaud ssc listing 1868-1967). For a list of the stations included in the N, T, and S collections, see below. NOTE: Please see the README file for more information on these data. ====================================================================== Column Fmt Description ---------------------------------------------------------------------- 1 A1 Blank 2- 5 I4 Year (19__) 6- 8 A3 Blank 9-10 I2 Month 11-13 A3 Blank 14-15 I2 Day 16-17 A2 Blank 18-20 F3.1 Time in tenths of hour 21-24 A4 Blank 25 I1 Code number of the ssc in the N collection (0, 1, 2 or 3 -- the number 9 occurs when no record was available) 26-29 A4 Blank 30 I1 Code number of the ssc in the T collection (0, 1, 2 or 3 -- the number 9 occurs when no record was available) 31-34 A4 Blank 35 I1 Code number of the ssc in the S collection (0, 1, 2 or 3 -- the number 9 occurs when no record was available) 36-39 A4 Blank 40 I1 0 if the ssc is normal, 1 if it's negative in the T collection 41-42 A2 Blank 43-45 F3.1 Duration in tenths of minutes 46 A1 Blank 47-50 F4.1 Amplitude in tenths of gammas of the H component in the N collection. Minus sign when appropriate. 0 if no record available. 51 A1 Blank 52-55 F4.1 Amplitude in tenths of gammas of the D component in the N collection. Minus sign when appropriate. 0 if no record available. 56 A1 Blank 57-60 F4.1 Amplitude in tenths of gammas of the H component in the T collection. Minus sign when appropriate. 0 if no record available. 61 A1 Blank 62-65 F4.1 Amplitude in tenths of gammas of the D component in the T collection. Minus sign when appropriate. 0 if no record available. 66 A1 Blank 67-70 F4.1 Amplitude in tenths of gammas of the H component in the S collection. Minus sign when appropriate. 0 if no record available. 71 A1 Blank 72-75 F4.1 Amplitude in tenths of gammas of the D component in the S collection. Minus sign when appropriate. 0 if no record available. 76 A1 Blank 77-80 F4.1 Amplitude projected in the X and Y directions of the geographic coordinate system, of the H component in the N collection. 81 A1 Blank 82-85 F4.1 Amplitude projected in the X and Y directions of the geographic coordinate system, of the D component in the N collection. 86 A1 Blank 87-90 F4.1 Amplitude projected in the X and Y directions of the geographic coordinate system, of the H component in the T collection. 91 A1 Blank 92-95 F4.1 Amplitude projected in the X and Y directions of the geographic coordinate system, of the D component in the T collection. 96 A1 Blank 97-100 F4.1 Amplitude projected in the X and Y directions of the geographic coordinate system, of the H component in the S collection. 101 A1 Blank 102-105 F4.1 Amplitude projected in the X and Y directions of the geographic coordinate system, of the D component in the S collection. 106 A1 Blank 107-110 F4.1 Amplitude projected in the X' and Y' directions of the dipole system, of the H component in the N collection. 111 A1 Blank 112-115 F4.1 Amplitude projected in the X' and Y' directions of the dipole system, of the D component in the N collection. 116 A1 Blank 117-120 F4.1 Amplitude projected in the X' and Y' directions of the dipole system, of the H component in the T collection. 121 A1 Blank 122-125 F4.1 Amplitude projected in the X' and Y' directions of the dipole system, of the D component in the T collection. 126 A1 Blank 127-130 F4.1 Amplitude projected in the X' and Y' directions of the dipole system, of the H component in the S collection. 131 A1 Blank 132-135 F4.1 Amplitude projected in the X' and Y' directions of the dipole system, of the D component in the S collection. 136 A1 Blank 137-140 F4.1 Amplitude computed from the observed H amplitude (in gammas) in collection T and corresponding to the amplitude on the dipole meridian by supposing that, at such latitude, the ssc is a pure magnetospheric effect: it is the value printed in column AT of the Mayaud list of ssc's (IAGA Bulletin No. 33 1868-1967 ssc's). The number 9999 is printed when the value is missing. 141 A1 Blank 142-145 F4.0 Amplitude of ANS in gammas as printed in the Mayaud list of ssc's. The number 9999 is printed when the value is missing. 146-149 A4 Blank 150 I1 The number 0, 1 or 2, where 0 = blank, 1 = N and 2 = S (as in Mayaud list) 151-154 A4 Blank 155 I1 For collection N, 0 = amplitude could be scaled in the D component; 1 = amplitude could not be scaled (never happens for collection N) 156-159 A4 Blank 160 I1 For collection T, 0 = amplitude could be scaled in the D component; 1 = amplitude could not be scaled (happens more frequently for collection T, especially in the last forty years -- see IAGA Bulletin No. 33, page 34 notes) 161-164 A4 Blank 165 I1 For collection S, 0 = amplitude coulde be scaled in the D component; 1 = amplitude could not be scaled (very rarely happens for collection S) 166-169 A4 Blank 170 I1 For N collection, 0 = master observatories used; 1 or 2 means that supplementary observatories were used for that ssc. 171-174 A4 Blank 175 I1 For T collection, 0 = master observatories used; 1 or 2 means that supplementary observatories were used for that ssc. 176-179 A4 Blank 180 I1 For S collection, 0 = master observatories used; 1 or 2 means that supplementary observatories were used for that ssc. 181-182 A2 Blank 183-185 I3 Order number of ssc in the year. 186 A1 Blank 187-190 I4 Order number of ssc in the Mayaud list 1868-1967 (2462 total). ---------------------------------------------------------------------------------- N, T, and S collections (list of observatories -- 0 = master observatories; 1 and 2 are supplementary observatories) Collection N 0 1 2 ============ === === === 1868-1884 Kew Greenwich - 1884-1900 Saint-Maur Kew - 1901 Val Joyeux Kew - 1902-1925 Val Joyeux Greenwich - 1926-1935 Val Joyeux Abinger - 1936-1956 Chambon la Foret Abinger - 1957-1967 Chambon la Foret Hartland - Collection T 0 1 2 ============ === === === 1870-1883 Colaba - - 1884-1900 Colaba Batavia - 1901-1904 Colaba Buitenzorg - 1905-1927 Alibag Buitenzorg - 1918-1961 Alibag Kuyper - 1962-1967 Alibag Tangerang - Collection S 0 1 2 ============ === === === 1868-1900 Melbourne --- --- 1901-1919 Melbourne Christchurch --- 1920-1938 Toolangi Amberley Watheroo 1939 Amberley Watheroo --- 1940-1958 Toolangi Amberley Watheroo 1959-1967 Toolangi Amberley Gnangara