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Prediction of upcoming grand episodes of solar activity

Published online by Cambridge University Press:  27 November 2018

G. L. Jayalekshmi  and
P. R. Prince
G. L. Jayalekshmi
Affiliation:
Department of Physics, University College Thiruvananthapuram, Kerala, India email: [email protected]
P. R. Prince
Affiliation:
Department of Physics, University College Thiruvananthapuram, Kerala, India [email protected]
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Abstract

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Sunspots are active regions on the surface of the Sun having strong magnetic fields. Activity level of the Sun shows long-time scale phenomena known as grand episodes-Grand maxima and Grand minima. Present study examines grand episodes shown by sunspot numbers (1090-2017), using methods of wavelet transform and sinusoidal regression. Time interval analysed includes two grand maxima and four grand minima. Interval in between grand episodes are regular oscillations. Phase changes found from periodicity analysis clearly show the presence of upcoming grand episodes. The forthcoming grand episodes are suggested to be two grand minima which are likely to occur between the years 2100-2160 and 2220-2300.

Keywords

Sunspotssolar cyclesolar activity, etc.
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S340: Long-term Datasets for the Understanding of Solar and Stellar Magnetic Cycles , February 2018 , pp. 325 - 326
Copyright
Copyright © International Astronomical Union 2018 

References

Nagovitsyn, Y. A., 1997, Meteoritics, 30, 490Google Scholar