An extension of the geomagnetic activity index series...

Geophysical Research Letters 1993 / 12 Vol. 20; Iss. 23

An extension of the geomagnetic activity index series aa for two solar cycles (1844-1868)

Nevanlinna, Heikki, Kataja, Eero
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Volume:
20
Language:
english
Journal:
Geophysical Research Letters
DOI:
10.1029/93gl03001
Date:
December, 1993
File:
PDF, 317 KB
english, 1993
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