The Sun as a Star

Remember: Sun = Big Ball O' Gas!

The sun is a typical star:

The Physical Structure of the Sun


Core - innermost 10-20%. High temperature, pressure. Nuclear reactions!

Radiative Zone - inner 70%. Energy moves by radiation.

Convective Zone - outer 30%. Energy moves by convection.

Photosphere - visible surface. Sunspots, prominances.

Chromosphere - lower atmosphere.

Corona - outer atmosphere. High temperature, low density. Origin of solar wind.

 The Sun in Motion

Rotation period: 26 days at equator, 36 days at pole -- not solid.


The Active Sun - A Solar Prominance (4-Sep-1999)