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In this paper the N-S asymmetry of the soft X-ray flare index during thesolar cycles 21, 22 and 23 has been analyzed. The results show the existence ofa real N-S asymmetry which is strengthened during solar minimum. The slope ofthe regression lines fitted to the daily values of asymmetry time series hasbeen found to be negative in all the three cycles. The yearly asymmetry curvecan be fitted by a sinusoidal function with a period of eleven years. The powerspectral analysis of daily asymmetry time series reveals the significantperiods of around 28.26 days, 550.73 days and 3.72 years.Comment: 15 pages; 8 figures; Published in Solar Physic

The North–South Asymmetry of Soft X-RAY Flare Index During Solar Cycles 21, 22 and 23