Date of Defense
The sun is a variable star. Its variability is evidenced by the probable fluctuation of its diameter and the time-dependence of its corpusular and electromagnetic emissions. The sun is also a magnetic star. The occurrence of sunspots, faculae, flares, prominences and active coronal features is intimately related to the existence of local magnetic fields. On the other hand, the shape of polar coronal rays is strongly suggestive of the existence of a general poloidal field. It's the variability of the sun's magnetic fields that gives rise to the variation in the output of the corpuscular and electromagnetic components of solar radiation.
Arora, Kamal K., "The Phenomenology of Sunspots" (1971). Honors Theses. 260.
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