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- W1985138919 abstract "view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS New observations of solar spicules. Roberts, Walter Orr ; Brenton, Virginia K. ; Shapley, Martha B. ; Kopal, Zdenek Abstract We have analyzed three coronagraph films taken to show the small hydrogen prominences we have called spicules. The films were made with a 4 A pass birefringent filter at Climax, Colorado. Two were taken in December 1943; one in February 1946. The frequency distribution of lifetimes shows that the spicules have very short mean lifetimes of the order of two minutes for all the films. Mean ascent velocities for the spicules on the 1946 film substantially exceed those for the two 1943 films which have mean velocities which are close together. Strong observational selection, however, affects all measures of velocity. Moreover, we cannot be sure that the velocities typical of the larger spicules represent the velocities of the far more frequent smaller spicules which it is difficult to measure. However, the results suggest a time-variation of the mean ascent velocity; this variation may be in phase with general solar activity variations. High Altitude Observatory, Boulder, Colo. andDepartment of Electrical Engineer~ng, Massachusetts Institute of Technology, Cambridge, Mass. Publication: The Astronomical Journal Pub Date: October 1950 DOI: 10.1086/106442 Bibcode: 1950AJ.....55R..80R full text sources ADS |" @default.
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- W1985138919 date "1950-01-01" @default.
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- W1985138919 title "New observations of solar spicules." @default.
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