1. M. J. Aschwanden, in Proceedings of the American Astronomical Society Meeting No. 224, June 1–5, 2014, Boston, MA (AAS, 2014), Abstract No. 123.6.
2. E. H. Avrett and R. Loeser, Astrophys. J. Suppl. Ser. 175, 229 (2008).
3. F. A. Gent, V. Fedun, and R. Erdelyi, Astrophys. J. 789, 42 (2014).
4. H. Grad, Rev. Mod. Phys. 32, 830 (1960).
5. R. A. Kopp and G. W. Pneuman, Solar Phys. 50, 85 (1976).