Which phenomenon is commonly associated with sunspots?

Sunspots are dark, cooler regions on the sun's surface caused by magnetic activity. They are associated with solar flares, which are sudden eruptions of energy in the sun's atmosphere that can occur when the magnetic fields around sunspots become unstable. When a flare occurs near a sunspot, it can lead to the release of large amounts of energy, radiation, and particles. This interplay highlights the dynamic relationship between sunspots and solar flares, making solar flares a common phenomenon related to sunspot activity.

In contrast, lunar eclipses, asteroids, and comets do not have a direct relationship with sunspot activity or solar phenomena. Lunar eclipses occur due to the positioning of the Earth, moon, and sun, while asteroids and comets are separate entities in the solar system that do not relate to solar magnetic activities. Thus, solar flares stand out as the phenomenon most closely linked to sunspots.