name and briefly describe the regions of sun??

Answer 1

Core = "The core is the only location in the Sun that produces an appreciable amount of heat via fusion: the rest of the star is heated by energy that is transferred outward from the core."
Radiation Zone = "From about 0.2 to about 0.7 solar radii, solar material is hot and dense enough that thermal radiation is sufficient to transfer the intense heat of the core outward."
Convection Zone = "...thermal convection occurs as thermal columns carry hot material to the surface (photosphere) of the Sun. Once the material cools off at the surface, it plunges back downward to the base of the convection zone, to receive more heat from the top of the radiative zone."
Photosphere = "The visible surface of the Sun, the photosphere, is the layer below which the Sun becomes opaque to visible light."
Atmosphere = "The parts of the Sun above the photosphere are referred to collectively as the solar atmosphere."
Sun Spots = "Sunspots are regions of intense magnetic activity where convection is inhibited by strong magnetic fields, reducing energy transport from the hot interior to the surface."

Answer 2

Structure:
-Core
-Radiation zone
-Convection zone
-Photosphere
-Atmosphere

I'd write a little about each section but it's hard to compress the information. Follow the wiki link, it has all the info there for you.

Cheers!