Lang, K.R. (2006). «5.1 MAGNETIC FIELDS IN THE VISIBLE PHOTOSPHERE». Sun, earth, and sky (2nd utg.). Springer. s. 81. ISBN978-0387304564. «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. Besøkt 21. mai 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. august 1999. Besøkt 21. mai 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.»