Hemispheric asymmetry of sunspot area in solar cycle 23 and rising phase of solar cycle 24: Comparison of three data sets |
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| Institution: | 1. Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China;2. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, China;3. University of the Chinese Academy of Sciences, Beijing 100049, China;1. 1393 Garvin Street, Prince George, BC, V2M 3Z1, Canada\n;3. Professor Emeritus Department of Physics and Astronomy, University of Calgary, Calgary, AB T2N 1N4, Canada |
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| Abstract: | Analysis of long-term solar data from different observatories is required to compare and confirm the various level of solar activity in depth. In this paper, we study the north–south asymmetry of monthly mean sunspot area distribution during the cycle-23 and rising phase of cycle-24 using the data from Kodaikanal Observatory (KO), Michelson Doppler Imager (MDI) and Solar Optical Observing Network (SOON). Our analysis confirmed the double peak behavior of solar cycle-23 and the dominance of southern hemisphere in all the sunspot area data obtained from three different resources. The analysis also showed that there is a 5–6 months time delay in the activity levels of two hemispheres. Furthermore, the wavelet analysis carried on the same data sets showed several known periodicities (e.g., 170–180 days, 2.1 year) in the north–south difference of sunspot area data. The temporal occurrence of these periods is also the same in all the three data sets. These results could help in understanding the underlying mechanism of north–south asymmetry of solar activity. |
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| Keywords: | The Sun Sunspots Sunspot area North–south asymmetry |
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