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Magnetic storms on Dec 21, 1999
Dec 21, 1999
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Magnetic storms in December 1999
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Geomagnetic storms on Dec 21, 1999
No
geomagnetic storms
were observed on Dec 21, 1999
Magnetic storms for the last 3 days
Max solar activity on Dec 21, 1999
No data for Dec 21, 1999