1. Batchelor, D. A., and Hindsley, K. P. 1991, Solar Phys., 135, 99.
2. Cowling, T. G. 1957, Magnetohydrodynamics (Interscience Publishers, Inc.: New York), p. 9.
3. Foukal, P. 1971, Solar Phys., 19, 59.
4. Hagyard, M. J. 1990, Mem. Soc. Astron. It., Vol. 61, No. 2, p. 337.
5. NASA CP-2439;Hagyard,1986