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We study the latitudinal distribution of sunspots observed from 1874 to 2009using the center-of-latitude (COL). We calculate COL by taking thearea-weighted mean latitude of sunspots for each calendar month. We then formthe latitudinal distribution of COL for the sunspots appearing in the northernand southern hemispheres separately, and in both hemispheres with unsigned andsigned latitudes, respectively. We repeat the analysis with subsets which aredivided based on the criterion of which hemisphere is dominant for a givensolar cycle. Our primary findings are as follows: (1) COL is not monotonicallydecreasing with time in each cycle. Small humps can be seen (or short plateaus)around every solar maxima. (2) The distribution of COL resulting from eachhemisphere is bimodal, which can well be represented by the double Gaussianfunction. (3) As far as the primary component of the double Gaussian functionis concerned, for a given data subset, the distributions due to the sunspotsappearing in two different hemispheres are alike. Regardless of whichhemisphere is magnetically dominant, the primary component of the doubleGaussian function seems relatively unchanged. (4) When the northern (southern)hemisphere is dominant the width of the secondary component of the doubleGaussian function in the northern (southern) hemisphere case is about twice aswide as that in the southern (northern) hemisphere. (5) For the distribution ofthe COL averaged with signed latitude, whose distribution is basicallydescribed by a single Gaussian function, it is shifted to the positive(negative) side when the northern (southern) hemisphere is dominant. Finally,we conclude by briefly discussing the implications of these findings on thevariations in the solar activity.

Bimodal Distribution of Area-Weighted Latitude of Sunspots And Solar North-South Asymmetry