Abstract
Statistical result shows that a large geomagnetic disturbance is most likely to occur at the time when a complex sunspot is in 6.7° E-19.9° E from the central meridian of the solar disk during the period 1968–1972.
References
Künzel, H.: 1960,Astron. Nachr. 285, 271.Solar-Geophysical Data: 1969–1973, U.S. Department of Commerce.
Warwick, C. S.: 1966,Astrophys. J. 145, 215.
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Horng, JT. Geomagnetic disturbances and complex sunspots. Astrophys Space Sci 35, L33–L34 (1975). https://doi.org/10.1007/BF00637009
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DOI: https://doi.org/10.1007/BF00637009