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DATE/TIME
2
Day of the year
2
Geomagnetic activity World Data Center for Solar-Terrestrial Physics
Geomagnetic observatory
K index
2
Lower limit for K = 9 depends on the latitude of the observatory
2
Maximum fluctuation
2
Soviet data
2
Station label
2
Sum of 8 index values per day
2
geomagnetism
2
geophysics
2
historical data
2
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