A general term would be Solar physicist.
Someone who studies the planet Mars is called an areologist.
An astronomer is a general term for someone who studies space, including planets, stars, galaxies, and other celestial bodies. They use techniques in physics and mathematics to understand the universe and its origins. They often use tools such as telescopes and spacecraft to observe and gather data.
A horologist studies time.
The real name for solar is the Sun.
The Maori name for sun is Te Rā.
The name for someone who studies caves is a speleologist or a spelunker.
A psychologist is the proper name for someone who studies the mind.
There is no special name for someone who studies Hebrew.
Someone who studies planetary systems is called a planetary scientist
chemist
Eugenicists
microbiologist :)
A geologist.
Ornothologist
chemist
A botanist is someone who studies plants.
Heliologist