Answer:
10.6 Years
Step-by-step explanation:
The Sun is a very volatile body. It shows a lot of features like solar flares, sun spots, prominence etc. These features are result of the magnetic field and differential rotation of the Sun. The regarding the no. of sun spots visible, solar flares, intensity of flares etc. have been collected for years and it can be seen that these activities follow a cycle with maxima and minima.
This cycle is of 10.6 years. The change in the solar activity also affects some terrestrial phenomenon such as Aurora.