The lifetime and evolution of fibrils

Details The lifetime and evolution of fibrils The lifetime and evolution of fibrils

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...50...37m&link_type=abstract

Solar Physics, vol. 50, Sept.-Oct. 1976, p. 37-48.

Physics

7

Chromosphere, Solar Activity, Solar Magnetic Field, Evolution, Filtergrams, H Alpha Line, High Resolution, Length, Lines Of Force, Time Response

Scientific paper

A detailed study has been made of the lifetimes and evolution of fibrils in McMath 12417, using high resolution filtergrams in H-alpha and Ca II K. It was found that when viewed near disk center, 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/sec, 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 H-alpha line confirms that the apparent extension and retraction of fibrils represents true mass motion.

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