Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...19112003j&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #120.03; Bulletin of the American Astronomical Society, Vol. 29, p.1402
Astronomy and Astrophysics
Astronomy
Scientific paper
The problem of the formation of the principle members of the resonance series of He I and He II at 584 Angstroms and 304 Angstroms remains a major unsolved problem of the solar atmosphere. Nevertheless, thanks to observations from the Goddard Solar Extreme Ultraviolet Rocket Telescope and Spectrograph (SERTS) and from the ESA/NASA SOHO mission, we now have a data base to address this problem and, hopefully, to solve it for the quiet atmosphere. This talk will briefly review alternatives for helium resonance line formation in the Sun, and will offer a few examples of observations that promise to help discriminate among them. Specifically, assuming electron collisional excitation is responsible for the 304 Angstroms line in the quiet Sun, supported by our earlier studies, evidence from SERTS and SOHO will be discussed in support of 'velocity redistribution' of the emitting ions in producing the observed profiles and fluxes.
Andretta Vincenzo
Jordan Stuart D.
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