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The 17-Month Periodicity of Sunspot Activity by M. Akioka; J. Kubota; M. Suzuki; K. Ichimoto; I. Tohmura is a Physics and Astronomy article available to read on EtoBox.

What is The 17-Month Periodicity of Sunspot Activity about?

A statistical study of sunspot activity during 1969 to 1986 was carried out by using the number of sunspot groups and their areas. We found a 17-month periodicity, which is consistent with the 500-day periodicity of flare occurrence (Ichimoto et aL, 1985). The short-term periodicity of sunspot activity has been discussed by many authors, commonly using the ZOrich sunspot number on the whole disk. Shapiro and Ward (1962) reported a 26-month periodicity and Rao (1973), 3.5-and 5.6-year periodicities of the sunspot number. Yacob and Bhargava (1968) mentioned a 16.3-month periodicity both in the sunspot number and in the geomagnetic data. Furthermore, Belmont et aL (1966) found a 19-month periodicity of the 10.7 cm solar radio flux and Ichimoto et al. (1985) a 17-month periodicity of flare occurrence. In this paper, we described the time variation of sunspot activity during the period from 1969 to 1986 using the area and the number of sunspot groups for both hemispheres as the indices of sunspot activity. The data base, including the area of sunspot groups, the locations and the Carrington rotation number of their occurrence was constructed for our purpose with the use of the data of s

Who reads The 17-Month Periodicity of Sunspot Activity?

Author

M. Akioka; J. Kubota; M. Suzuki; K. Ichimoto; I. Tohmura

Publisher

Springer; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 0038-0938)

Published

1987

Language

EN

Field

Physics and Astronomy (Physical Sciences)