A New Method for Norht-South Asymmetry of Sun Spot Area

Details A New Method for Norht-South Asymmetry of Sun Spot Area A New Method for Norht-South Asymmetry of Sun Spot Area

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jass...24..261c&link_type=abstract

Journal of Astronomy and Space Sciences. Vol. 24, no. 4, 261-268

Astronomy and Astrophysics

Astronomy

4

Sun: Sunspot, Methods: Data Analysis

Scientific paper

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 background 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.

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