Abstract
A detailed study has been made of the lifetimes and evolution of fibrils in McMath 12417, using high resolution filtergrams in Hα and Ca ii K made at Big Bear Solar Observatory. It was found that when viewed near disk centre, the lifetime of a fibril is a monotonically increasing function of its maximum apparent length. This relationship, together with the form of the variation of fibril lengths as a function of time, suggests that fibrils result from material being impulsively injected into magnetic field lines at approximately 30 km s−, and returning under gravity. The lifetimes and apparent lengths of fibrils are then a function of the inclination of the field lines only. A study of wavelength scans through the Hα line confirms that the apparent extension and retraction of fibrils represents true mass motion.
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Marsh, K.A. The lifetime and evolution of fibrils. Sol Phys 50, 37–48 (1976). https://doi.org/10.1007/BF00206188
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DOI: https://doi.org/10.1007/BF00206188