Answer:
its strong magnetic fields reduce convection and prevent hot plasma from entering
Step-by-step explanation:
The energy produced by the Sun is not emitted uniformly through its surface, but undergoes variations, with times of maximum emission and others of minimum, with an approximate period of 11 years. This period is known as the Solar Cycle and is determined by the number of sunspots. The luminosity of our Sun varies only 0.1% throughout its solar cycle. However, these seemingly tiny variations can have a significant effect on the Earth's climate.
In the photosphere (outer layer of the Sun that is seen), sunspots are formed, which are regions of the solar surface represented by dark, cold, extremely magnetized and ephemeral areas, whose diameter can exceed 130000 km. Temperatures in the Dark spots of sunspots fall to about 3700 K (compared to 5800 K in the surrounding photosphere). A sunspot only lasts a few days or weeks before disappearing and as soon as one of them disappears, another emerges and takes its place.
In sunspots the lines of the Sun's powerful magnetic fields (thousands of times stronger than Earth's magnetic field) emerge from the photosphere and form extensive local magnetic loops. These eruptions are due to the fact that the equatorial part of the solar surface rotates faster than in the other latitudes. The powerful magnetic fields present in the spots inhibit the local flow of heat from the lower layers, so that they are between 1500 K and 2000 K cooler and therefore darker than the rest of the visible surface.
The number of sunspots in the Sun is not constant and changes over the period of 11 years on average, with solar activity directly related to that cycle. Every eleven years the spots disappear and when they appear again they have reversed polarity. The average period of a solar cycle is 131 months, with a standard deviation of 14 months.