In the present work, we study the time evolution, significance of the N-S asymmetry excesses presented as a function of the solar cycle and prominent rotational periods (∼27 d) separately for the northern and southern hemispheres. We have investigated short-term variations of the hemispheric solar activity (sunspot numbers and sunspot areas) during the time period 2010–2015, which covers the ascending and the maximum phase of solar cycle 24. We have implemented the Lomb-Scargle periodogram and continuous wavelet transform power spectrum techniques to study the time evolution and dominant rotational periods separately for the northern and southern hemispheres, and whole solar disk. Our results showed that the northern hemisphere exhibited longer solar synodic periods than the southern hemisphere, indicating that the northern hemisphere has a lower rotation rate. Moreover, the northern hemisphere was found to be dominant before transferring to the southern hemisphere during mid-2013. Also, the sunspot areas clearly demonstrated a two-peak structure of solar activity in the northern and southern hemispheres respectively during 2012 and 2014. The statistical significance of the southern hemisphere affirmed enhanced excess during the maximum phase of solar cycle 24.

在目前的工作中，我们研究了时间演化、NS 不对称过度的重要性作为太阳周期的函数以及北半球和南半球的显着旋转周期（~27 天）。我们研究了 2010-2015 年期间半球太阳活动（太阳黑子数量和太阳黑子面积）的短期变化，涵盖了太阳周期 24 的上升阶段和最大阶段。我们实施了 Lomb-Scargle 周期图和连续小波变换功率谱技术分别研究南北半球和整个太阳盘的时间演化和主要旋转周期。我们的研究结果表明，北半球比南半球表现出更长的太阳会合周期，表明北半球的自转速度较低。此外，在 2013 年中期转移到南半球之前，发现北半球占主导地位。此外，太阳黑子区域在 2012 年和 2014 年分别在北半球和南半球清楚地显示出太阳活动的两个峰值结构。南半球的统计意义肯定了太阳周期 24 最大阶段的过度增强。