Lang, K.R. (September 2006). Sun, earth, and sky, 2nd. Springer, "5.1 MAGNETIC FIELDS IN THE VISIBLE PHOTOSPHERE", 81. ISBN 978-0-387-30456-4 "this opaque layer is the photosphere, the level of the Sun from which we get our light and heat"
The Sun's Corona – Introduction. NASA. Geraadpleegd op 21 mei 2010. “Now most scientists believe that the heating of the corona is linked to the interaction of the magnetic field lines.”
sciencedaily.com
"Beyond the Blue Horizon" – A Total Solar Eclipse Chase (5 augustus 1999). Geraadpleegd op 21 mei 2010. “On ordinary days, the corona is hidden by the blue sky, since it is about a million times fainter than the layer of the sun we see shining every day, the photosphere.”