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Ogg 1946
Ogg, A. (1946). Three-hour-range indices, K, of geomagnetic activity at the magnetic observatory, Hermanus, comparison with K-indices at American-operated observatories, and mean K-indices, K A, for the years 1941–44. Terrestrial Magnetism and Atmospheric Electricity 51: doi: 10.1029/TE051i001p00075. issn: 0096-8013.
Journal
Terrestrial Magnetism and Atmospheric Electricity
Publisher
American Geophysical Union
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