The international 5 and 10 quietest and 5 most disturbed days [1932 - ]
Explanation on the quietest and disturbed days
By GFZ, Potsdam.
GFZ Potsdam Q-days and D-days Page.
International Q-Days and D-Days are now derived by GeoForschungsZentrum (GFZ) Potsdam
from Kp index.
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