Caption: A cartoon of the outer layers of the Sun.
The solar photosphere is about 500 km thick and the chromosphere is about 10,000 km thick.
They are both geometrically thin compared to the solar radius R_☉ = 6.957*10**5 km = 109 R_eq_⊕ ≅ 700,000 km (which is the radius of the solar photosphere). Together they constitute what is usually considered the solar atmosphere though the corona included too.
See also Sun keywords below (local link / general link: keywords_sun.html):
Credit/Permission: ©
David Jeffery,
2004 / Own work.
Image link: Itself.EOF
Local file: local link: sun_outer_layers_cartoon.html.
File: Sun file:
sun_outer_layers_cartoon.html.