A comparison of spicules in the H-alpha and He II /304 A/ lines

Details A comparison of spicules in the H-alpha and He II /304 A/ lines A comparison of spicules in the H-alpha and He II /304 A/ lines

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...40...65m&link_type=abstract

Solar Physics, vol. 40, Jan. 1975, p. 65-68.

Physics

9

H Alpha Line, Helium Ions, Lyman Spectra, Satellite Observation, Solar Spectra, Spicules, Balmer Series, Ground Stations, Line Spectra, Skylab Program, Solar Limb

Scientific paper

On 1974 January 29 and 31, simultaneous satellite observations of spicule-like features in the 304-A L-alpha line of He(+) and ground observations of H-alpha spicules were obtained. It was then attempted to find a correlation between features of these two observations. Direct visual comparison failed to show a significant correspondence between the spicules in the He II and H-alpha spicules. Then the location and orientation of spicules in both images were measured and a correlation criterion was defined. Again no significant correspondence was found. It is concluded that the spicule-like structures in the He II (304) line are quite different from the H-alpha spicules. The possibility remains, though, that spicules are the same structures in both lines but that some spicules emit more strongly in He II (304) whereas others are better visible in H-alpha.

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