[freebeard]

Originally Posted by CR

Would be right to presume that with less hydrogen it activity it's not the same ?

https://en.wikipedia.org/wiki/Layers...rgy_production

Core
The core is the only region in the Sun that produces an appreciable amount of thermal energy through fusion; 99% of the power is generated within 24% of the Sun's radius, and by 30% of the radius, fusion has stopped nearly entirely. The remainder of the Sun is heated by this energy as it is transferred outwards through many successive layers, finally to the solar photosphere where it escapes into space as sunlight or the kinetic energy of particles.
...[snip the science]...
Theoretical models of the Sun's interior indicate a power density of approximately 276.5 W/m3,[86] a value that more nearly approximates that of reptile metabolism or a compost pile[87] than of a thermonuclear bomb.
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Atmosphere
During a total solar eclipse, the solar corona can be seen with the naked eye, during the brief period of totality.

During a total solar eclipse, when the disk of the Sun is covered by that of the Moon, parts of the Sun's surrounding atmosphere can be seen. It is composed of four distinct parts: the chromosphere, the transition region, the corona and the heliosphere.

The coolest layer of the Sun is a temperature minimum region extending to about 500 km above the photosphere, and has a temperature of about 4,100 K....

The chromosphere, transition region, and corona are much hotter than the surface of the Sun.[93] The reason is not well understood, but evidence suggests that Alfvén waves may have enough energy to heat the corona.[99]

TLDR; Space Weather.

Coincidently, the other day in the grocery store parking lot I saw a Toyota Corona. It had Celica mags and sticker-bombed rear windows.