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- W2055241142 abstract "view Abstract Citations (139) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A newly observed solar feature: macrospicules in He II 304 Ã…. Bohlin, J. D. ; Vogel, S. N. ; Purcell, J. D. ; Sheeley, N. R., Jr. ; Tousey, R. ; Vanhoosier, M. E. Abstract He II 304 A spectroheliograms, obtained with the NRL extreme-ultraviolet slitless spectrograph during the Skylab mission, show spikelike structures at the sun's polar limb which resemble the familiar H-alpha spicules. However, the relatively large size and long life of these He II features has led to distinguishing them by the name 'macrospicules'. The macrospicules appear as protuberances or jets, ranging from 5 to over 60 sec in length, from 5 to 30 sec in width, and from 5 to over 40 minutes in lifetime. Perhaps the most radical departure from H-alpha spicules is that macrospicules occur only within the chromospheric boundaries of coronal holes. Thus macrospicules are most easily visible over the solar poles due to the coronal holes normally present there, and much less frequently at lower latitudes during limb passage of relatively rare, low-latitude coronal holes. Publication: The Astrophysical Journal Pub Date: May 1975 DOI: 10.1086/181794 Bibcode: 1975ApJ...197L.133B Keywords: Far Ultraviolet Radiation; Helium Ions; Solar Spectra; Spicules; Ultraviolet Spectra; H Alpha Line; Skylab Program; Solar Limb; Solar Prominences; Spectroheliographs; Solar Physics full text sources ADS |" @default.
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- W2055241142 date "1975-05-01" @default.
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- W2055241142 title "A newly observed solar feature - Macrospicules in He II 304 A" @default.
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