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STORM SUDDEN COMMENCEMENTS (ssc) 1868 to present:

STORM1 and STORM2 Lists: (Some text here is exerpted from IAGA Bulletin 39)

1868-1967 data (STORM1.SSC) are from IAGA Bulletin 33. These data are based on
3 observatories. Only one of them was at a low latitude; the other two, with
an invariant magnetic latitutde of 50 degrees, were strongly sensitive to the
auroral effect.

1968-1975 data (STORM2.SSC) are from IAGA Bulletin 39. These data are much more
reliable. The monthly reports from all observatories guarantee that very few
events are omitted. With the examination of five low-latitude records, the
changes of rhythm could be evaluated much better, and events were kept or
rejected on a more rational basis. However, it is probable that, for statis-
tical use, both lists will be relatively homogeneous. Indeed, Alibag was the
low-latitude observatory of the 100-year list and belongs, in the 1968-1975
list, to the group for which the amplitudes are close to the average of five
observatories.

1976-1982 data are from IAGA Bulletin 32 series. These data are reduced in
the same manner as the 1968-1975 data. 1983-to-the-present data are from
the monthly ISGI Bulletins (DeBilt, Netherlands - 1983-1987 data; Institut de
Physique du Globe, Paris, France - 1988 to the present data).


ALTERNATE List:

1967-to-the-present data (ALTERNAT.SSC) are from IAGA Bulletins 12 (1967-1969);
IAGA Bulletins 32 (1970-1982); and Preliminary Reports of the ISGI monthly
Bulletins (DeBilt 1981-87, Institut de Physique du Globe, France 1988 to the
present). This list contains more information about sfe's, pi's, pc's, b's,
bps, etc., which occurred with the storms. It, however, is not based on the
homogeneity of using only equatorial stations, as in the above lists.