^ 1.01.1"Beyond the Blue Horizon" – A Total Solar Eclipse Chase. 1999-08-05 [2010-05-21]. 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.
^ 3.03.1Lang, K.R. 5.1 MAGNETIC FIELDS IN THE VISIBLE PHOTOSPHERE. Sun, earth, and sky 2nd. Springer. September 2006: 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
^Mariska, J.T. The solar transition region. : 60. ISBN 978-0-521-38261-8. 100 km suggested by average models
^The Sun's Corona – Introduction. NASA. [2010-05-21]. Now most scientists believe that the heating of the corona is linked to the interaction of the magnetic field lines.
^Lewis, J.S. Physics and chemistry of the solar system Second. Elsevier Academic Press. 2004-02-23: 87. ISBN 978-0-12-446744-6. The dominant color is influenced by the Balmer radiation of atomic hydrogen
