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Solar Physics

, Volume 260, Issue 1, pp 225–232 | Cite as

Prediction of the Maximum Amplitude and Timing of Sunspot Cycle 24

  • Nipa J. Bhatt
  • Rajmal Jain
  • Malini Aggarwal
Article
First Online:
Received:
Accepted:

Abstract

Precursor techniques, in particular those using geomagnetic indices, often are used in the prediction of the maximum amplitude for a sunspot cycle. Here, the year 2008 is taken as being the sunspot minimum year for cycle 24. Based on the average aa index value for the year of the sunspot minimum and the preceding four years, we estimate the expected annual maximum amplitude for cycle 24 to be about 92.8±19.6 (1-sigma accuracy), indicating a somewhat weaker cycle 24 as compared to cycles 21 – 23. Presuming a smoothed monthly mean sunspot number minimum in August 2008, a smoothed monthly mean sunspot number maximum is expected about October 2012±4 months (1-sigma accuracy).

Keywords

Sun: sunspot number Sun: prediction technique, geomagnetic activity index aa 
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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.C. U. Shah Science CollegeAhmedabadIndia
  2. 2.Physical Research LaboratoryAhmedabadIndia

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