The solar activity cycle varies in amplitude. The last Solar Cycle 24 is the weakest in the past century. Sun’s activity dominates Earth’s space environment. The frequency and intensity of Sun’s activity follow the solar cycle. Hence there are practical needs to know the amplitude of the upcoming Solar Cycle 25. Dynamo-based solar cycle predictions not only provide forecasts, but also offer an effective way to evaluate our understanding of the solar cycle. In this article we apply the method of the first successful dynamo-based prediction developed for Solar Cycle 24 to predict Solar Cycle 25, so that we can verify whether the previous success is repeatable. The prediction shows that Solar Cycle 25 would be about 10% stronger than Solar Cycle 24 with an amplitude of 126 (international sunspot number Version 2.0). The result suggests that Solar Cycle 25 will not be the beginning of a Maunder-like grand solar minimum as suggested by some publications. The solar behavior in about four to five years will confirm whether the prediction method captures the key mechanism for solar cycle variability, which is the polar field around the cycle minimum in our model.

太阳活动周期的幅度不同。最后一个太阳周期 24 是过去一个世纪中最弱的。太阳的活动支配着地球的空间环境。太阳活动的频率和强度遵循太阳周期。因此，实际需要了解即将到来的太阳活动周期 25 的幅度。基于发电机的太阳活动周期预测不仅提供预测，而且还提供了一种评估我们对太阳活动周期理解的有效方法。在本文中，我们应用为太阳周期 24 开发的第一个成功的基于发电机的预测方法来预测太阳周期 25，以便我们可以验证之前的成功是否可重复。预测显示，太阳活动周期 25 将比太阳活动周期 24 强约 10%，振幅为 126（国际太阳黑子编号版本 2.0）。结果表明，太阳活动周期 25 不会是一些出版物所建议的类似蒙德的大太阳活动极小期的开始。大约四到五年内的太阳行为将确认预测方法是否捕获了太阳周期变化的关键机制，即我们模型中周期最小值附近的极地场。