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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