In this paper, a broad examination of the N-S asymmetry of daily sunspot numbers during the period January 1992 to March 2020 has been performed, examining its statistical significance and looking for the short term periodicity of daily sunspot numbers using the Fast Fourier Transform (FFT) during solar cycle 22 (1 January 1986 to 27 August 1996), cycle 23 (28 August 1996 to 10 December 2008) and cycle 24 (11 December 2008 to 31 March 2020). The present study indicates that sunspot number activity dominates in the southern hemisphere during the solar cycles 22 and 23, while during the solar cycle 24, the sunspot number becomes dominant in the northern hemisphere. It is also revealed that the magnitude of sunspot number activity for solar cycle 23 is more prominent in both the northern and southern hemispheres than in solar cycles 22 and 24. The power spectrum of daily sunspot numbers shows several significant periodicities in a wide range between 26 days and 83 days. We discuss the possible explanations of the observed periodicities and north-south asymmetry of the daily sunspot number in light of previous results and existing techniques.

在本文中，对 1992 年 1 月至 2020 年 3 月期间每日太阳黑子数的 NS 不对称性进行了广泛检查，检查其统计意义并使用快速傅里叶变换 (FFT) 寻找每日太阳黑子数的短期周期性在第 22 个太阳周期（1986 年 1 月 1 日至 1996 年 8 月 27 日）、第 23 个太阳周期（1996 年 8 月 28 日至 2008 年 12 月 10 日）和第 24 个太阳周期（2008 年 12 月 11 日至 2020 年 3 月 31 日）期间。本研究表明，在太阳周期 22 和 23 期间，南半球的太阳黑子数量活动占主导地位，而在太阳周期 24 期间，太阳黑子数量在北半球占主导地位。还揭示了太阳周期 23 的太阳黑子数量活动幅度在北半球和南半球都比太阳周期 22 和 24 更为突出。每日太阳黑子数量的功率谱显示了在 26 天到 83 天之间的广泛范围内的几个显着周期性。我们根据以前的结果和现有技术讨论了观测到的周期性和每日太阳黑子数的南北不对称的可能解释。