Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...197l.133b&link_type=abstract
Astrophysical Journal, vol. 197, May 1, 1975, pt. 2, p. L133-L135. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
85
Far Ultraviolet Radiation, Helium Ions, Solar Spectra, Spicules, Ultraviolet Spectra, H Alpha Line, Skylab Program, Solar Limb, Solar Prominences, Spectroheliographs
Scientific paper
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.
Bohlin David J.
Purcell J. D.
Sheeley Neil R. Jr.
Tousey Richard
Vanhoosier Michael E.
No associations
LandOfFree
A newly observed solar feature - Macrospicules in He II 304 A does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A newly observed solar feature - Macrospicules in He II 304 A, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A newly observed solar feature - Macrospicules in He II 304 A will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1048072