GEOMAGNETIC SUDDEN STORM COMMENCEMENTS (SSC) 1968 to present

Format for MAYAUD2 data (additions to Mayaud Sudden Commencement data
   1868-1967):

Data are from IAGA Bulletin No. 39 (1968-1975); IAGA Bulletins No.
32g-m (1976-1982); and Preliminary Reports of the ISGI (DeBilt 1981-87;
Institut de Physique du Globe, France, 1988 to present)

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
 18-21    I4    Begin time
 22-25    A4    Blank
 26-27    I2    Number stations reporting an A event
 28       A1    Letter A -- denotes very remarkable event observed
 29-31    A3    Blank
 32-33    I2    Number of stations reporting a B event
 34       A1    Letter B -- denotes fair, ordinary, but unmistakable
                  event observed
 35-37    A3    Blank
 38-39    I2    Number of stations reporting a C event
 40       A1    Letter C -- denotes very poor, doubtful event observed
 41-44    A4    Blank
 45-62    A18   Blank
 63-64    I2    Number of stations reporting an "si" event
 65-66    A2    Letters "si" -- sudden impulse event (sudden magnetic 
                  change which could not be classified as ssc, bs, etc.)
 67-71    A5    Blank
 72       I1    Code number of observatory 1 (see below)
 73       A1    Blank
 74       I1    Code number of observatory 2 (see below)
 75       A1    Blank
 76       I1    Code number of observatory 3 (see below)
 77       A1    Blank
 78       I1    Code number of observatory 4 (see below)
 79       A1    Blank
 80       I1    Code number of observatory 5 (see below)
 81-85    A6    Blank
 86-89    F4.1  Average duration in minutes
 90-92    A3    Blank
 93-95    F3.0  Average amplitude in nanoteslas
 ---------------------------------------------------------------------
 Network of Low Latitude Observatories:  M'Bour, Fuquene, Honolulu, Port 
     Moresby and Alibag (alternates -- Tamanrasset, Paramaribo, Apia,
     Kanoya, and Hyderabad).

 For a complete definition of the code numbers imposed on each SSC, 
     please see IAGA Bulletin No. 39 pages 105-106:

       0 = Observatory did not see the event or event does not deserve to 
              be called an SSC;
       1 = Event is possibly an SSC but not sufficiently clear -- other 
              records from other longitudes needed to verify;
 2 and 3 = Event is definitely an SSC -- 3 is assigned when the following 
              3 features are present: very sharp change of rhythm, large 
              amplitude, and remarkable morphology.