Abstract
The recent, unusual solar cycle and solar minima between Cycles 23 and 24 have been studied extensively. Wavelet analysis of hourly cosmic-ray intensity during the last five solar minima reveals a number of short-term variations with few temporal shifts in the periods. This study suggests that deviations with a one-solar-rotation period and its harmonics are small during the recent minimum. However, deviations are considerably larger during the other minima. Analysis also demonstrates that the behavior of active regions is nearly the same during the minima of Cycles 19, 20, 21, and 22. The results also suggest that regions outside the streamer stalk are significantly larger in the recent solar minimum as opposed to the other minima.
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Acknowledgements
We gratefully acknowledge the use of Oulu and Lomnicky Stit neutron-monitor data. We thank the station Managers of Oulu (Ilya Usoskin) and Lomnicky Stit (Karel Kudela) NMs for making these data available. Wavelet software provided by C. Torrence and G. Compo is also acknowledged with thanks.
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Singh, Y.P., Badruddin Short-Term Variations of Cosmic-Ray Intensity During the Recent Deep Solar Minimum and the Previous Four Solar Minima: A Wavelet Analysis. Sol Phys 290, 3071–3079 (2015). https://doi.org/10.1007/s11207-015-0762-4
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DOI: https://doi.org/10.1007/s11207-015-0762-4