Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...299..921s&link_type=abstract
Astronomy and Astrophysics, v.299, p.921
Astronomy and Astrophysics
Astrophysics
20
Sun: Prominences
Scientific paper
The Halpha_, Hbeta_, and He D_3_ emission lines are simultaneously observed with high spatial resolution at the VTT on Tenerife. It is found that the emission ratios He D_3_/ Hbeta_ and He D_3_/Halpha_ show typical mean values for each individual prominence. This branching is related to the mean kinetic temperature and to the structuring of each prominence. Whereas the Balmer excitation is almost uniformly distributed throughout prominences, the He excitation is enhanced in structured prominences of low Balmer brightness or outer parts of unstructured bright prominences, where exciting and ionizing EUV radiation can freely penetrate. In these regions the He ionization may exceed that of hydrogen. The atmospheric prominence parameters are not yet sufficiently known to allow a reliable determination of the solar Helium abundance.
Stellmacher Goetz
Wiehr Eberhard
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