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http://dx.doi.org/10.5140/JASS.2007.24.4.261

A NEW METHOD FOR NORTH-SOUTH ASYMMETRY OF SUN SPOT AREA ANALYSIS  

Chang, Heon-Young (Department of Astronomy and Atmospheric Sciences, Kyungpook National University)
Publication Information
Journal of Astronomy and Space Sciences / v.24, no.4, 2007 , pp. 261-268 More about this Journal
Abstract
We have studied the temporal variation in the North-South asymmetry of the sunspot area during the period from 1874 to 2007. Though the 9-year periodicity is commonly reported, shorter periodicities is still under study. We employ the cepstrum analysis method to analyze the noisy power spectrum of the North-South asymmetry. We demonstrate that the cleaned power spectrum shows reduction of the spurious back-ground noise level. Some of short period peaks in the power spectrum disappear after deconvolution. It should be, however, pointed out that power spectrum might look less noisy because of a filtering process during deconvolution. We conclude by pointing out that a more sophisticate filtering algorithm is required to produce a precise and reliable periodicity estimate.
Keywords
sun; sunspot-methods; data analysis;
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