Physics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...49..283e&link_type=abstract
Solar Physics, vol. 49, Aug. 1976, p. 283-295.
Physics
77
Chromosphere, Filtergrams, Fine Structure, H Alpha Line, Solar Limb, Solar Prominences, Spectral Energy Distribution, Brightness Temperature, Life (Durability), Lyman Spectra, Optical Density
Scientific paper
The fine structure of nonspot prominences is studied in H-alpha filtergrams. The size of the smallest prominence structures increases with height above the chromosphere. Some prominences contain structures close to 0.5 arcsec, which is the spatial resolution in the data. The effective thickness of many nonspot prominences ranges between 40 million and 150 million cm. An apparent downward-directed motion is observed in the majority of the prominences. No preferred direction of the motion is seen in regions composed of comparatively large diffuse structures. Some bright threads are visible for 1 hr and longer. Bright knots have an average observed lifetime of about 8 min. The process of condensation and subsequent destruction of prominence fine structure appears to take place on a very short time scale compared with the lifetime of the regions where prominences may exist. The observed H-alpha brightness of the prominences in the present data may be accounted for as scattered chromospheric radiation.
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