The three major interior zones are:
The Core: The innermost part of the Sun where energy is generated by
nuclear reactions
The Radiative Zone: Where energy travels outward by radiation through
about 70% of the Sun
The Convection Zone: In which convection currents circulate the Sun's
energy to the surface
Other parts identified are:
Sunspot: A temporary disturbed area in the solar photosphere that appears
dark because it is cooler than the surrounding areas. Sunspots consist of
concentrations of strong magnetic flux
Photosphere: The visible surface of the Sun. It consists of a zone in which
the gaseous layers change from being completely opaque to radiation to
being transparent. It is the layer from which the light we actually see (with
the human eye) is emitted
Chromosphere: The layer of the solar atmosphere that is located above the
photosphere and beneath the corona. The chromosphere is hotter than
the photosphere but not as hot as the corona
Corona: The outermost layer of the solar atmosphere. The corona consists
of highly rarefied gas at a temperature greater than one million degrees
Kelvin. It is visible to the naked eye during a solar eclipse
Coronal Streamer: Large scale magnetic structure observed in the Sun's
corona
Prominence: A structure in the corona consisting of cool plasma supported
by magnetic fields. Prominences are bright structures when seen at the
Sun's edge. However, when seen against the bright solar disk, they are
dark and are called filaments
Source/Credits: Solar & Heliospheric Observatory (SOHO). SOHO is a project of international cooperation between ESA and NASA