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Principal Magnetic Storms - These data present the principal magnetic storms
for the month as reported by several observatories through cooperation with
the International Association of Geomagnetism and Aeronomy. These are the
data formerly published in the Journal of Geophysical Research. They are now,
however, grouped by the storm rather than by station. The geomagnetic
latitude of the station is indicated. The beginning time is given to the hour
and minute in UT.

The type of sudden commencement, if any, together with its magnitude in each
element D, H or Z is next in the format: sc = sudden commencement;
sc* = small initial impulse followed by main impulse (in this case the
amplitude is that of the main pulse only, neglecting the initial brief pulse);
dots in these columns represent a storm with gradual commencement; blanks
indicate no data entries. Signs of amplitudes of D and Z are taken
algebraically; D reckoned positive if toward the east and Z reckoned positive
if vertically downward. In the next columns the day and the three-hour
periods on that day when the K index reached its maximum are given followed by
the K index value. In the next three columns the maximum ranges in D, H and
Z during the storm are given. The ending time is given only to the nearest
hour. This is the time of cessation of reasonably marked disturbance
movements in the trace. More specifically, it is the time when the K index
measure has diminished to 2 or less for a reasonable period. For each date
the data are listed in north-to-south geomagnetic latitude order. The
observatories reporting are listed below the table each month in SGD. The
abbreviations used for the observatory names are as follows:

GEOMAGNETIC OBSERVATORIES

Code Station Geomag Latitude

ABG Alibag 9.5N
AMS Martin de Vivies 42.9S
ANN Annamalainagar 1.5N
API Apia 16.0S
BJI Beijing 28.5N
CAN Canberra 43.9S
CMO College 64.6N
CZT Port Alfred 38.5S
DRV Dumont d'Urville
(Terre Adelie) 75.6S
ETT Etaiyapuram 00.6S
FRD Fredericksburg 49.6N
GNA Gnangara 43.2S
GUA Guam 4.0N
HER Hermanus 33.7S
HON Honolulu 21.1N
HYB Hyderabad 7.6N
JAI Jaipur 17.3N
KRC Karachi 16.4N
PAF Port aux Francais
(Kerguelen) 56.5S
PMG Port Moresby 18.6S
SHL Shillong 14.7N
SIT Sitka 60.0N
TRD Trivandrum 1.1S
UJJ Ujjain 13.5N