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Dependence of solar cycles duration on the magnitude of the annual module of the sunspots magnetic field

Published online by Cambridge University Press:  18 July 2013

Valery N. Krivodubskij  and
Natalia I. Lozitska
Valery N. Krivodubskij
Affiliation:
Astronomical Observatory of Kyiv National Taras Shevchenko University Observatorna Street 3, Kyiv - 53, 04053, Ukraine email: krivod1@observ.univ.kiev.uanloz@observ.univ.kiev.ua
Natalia I. Lozitska
Affiliation:
Astronomical Observatory of Kyiv National Taras Shevchenko University Observatorna Street 3, Kyiv - 53, 04053, Ukraine email: krivod1@observ.univ.kiev.uanloz@observ.univ.kiev.ua
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Abstract

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The dependence of the solar cycle duration, T, on the 3 years averaged module of the large-scale sunspots magnetic fields (30-60 arcsec), Bsp index, was investigated on the base of about 10,000 visual observations conducted during last eight (16-23) cycles. It was found that the duration T of the investigated cycles linearly depends on the index Bsp of the magnetic fields observed during 3 years on decline phase of the solar cycle (second, third and fourth years after solar maximum Tmax). Namely, the duration of the cycles T was varied between 9,5 and 12,5 years, when the magnetic index Bsp was ranged from 2450 to 2600 G. An explanation for this dependence is proposed within the framework of non-linear αΩ- dynamo model. We found the following equation for the dependence of solar dynamo-period on magnetic index: T ≈ Bsp3/2. Therefore, the large observed index Bsp, the longer calculated period T.

Keywords

Sun: activitySun: sunspotsmagnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 71 - 72
Copyright
Copyright © International Astronomical Union 2013 

References

Krivodubskij, V. N. 2005, AN, 3, 61 Google Scholar
Krivodubskij, V. N. 2012, This volume Google Scholar
Lozitska, N. I. 2005, Kinenatika i Fizika Nebes. Tel (Suppl.), 5, 151 Google Scholar
Rüdiger, G. & Kitchatinov, L. L. 1993, AA, 269, 581 Google Scholar