How does a natural ""solar thermostat"" keeps the core fusion rate steady in the sun?

Explanation:

What is solar thermostat?

A solar thermostat automatically regulates temperature of the sun when the temperature reaches a certain point and its also known as gravitational equilibrium.

NOTE: if the core temperature decreases, then the fusion rate decreases and this lowers the pressure and the cause the core to contract and heat up.

Also, the increase in core temperature, increases the fusion rate and this raise the core pressure and this cause the core expands and cools down.

The fusion rate of the sun increase when core is a bit hotter. This increase in the rate of fusion produces more energy, which cause the core to expand slightly and cool.

The fusion rate is then slow down due to the cooling until the sun get back to it's original size and temperature. The fusion that occur in the sun concerts hydrogen into helium, energy and neutrinos.

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..