Measuring the He I/H ratio in a prominence using Lyman absorption

Details Measuring the He I/H ratio in a prominence using Lyman absorption Measuring the He I/H ratio in a prominence using Lyman absorption

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spd....28.0112k&link_type=abstract

American Astronomical Society, SPD meeting #28, #01.12; Bulletin of the American Astronomical Society, Vol. 29, p.881

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Scientific paper

We investigate a method for measuring the ratio of neutral helium to hydrogen in solar prominences. The upper limit to the Lyman continuum occurs at 911 Angstroms for H, 504 Angstroms for He I, and 228 Angstroms for He II. Lyman absorption by prominences and other structures is clearly visible in emission of hot coronal lines observed by the Coronal Diagnostic Spectrometer (CDS) and Extreme Ultraviolet Imaging Telescope (EIT) aboard the Solar and Heliospheric Observatory (SOHO). By comparing the absorption in lines absorbed by H only and by H and He I, the ratio of He I to H in prominences can be determined. We attempt to do this by comparing the absorption by a prominence in the Mg X line at 624.9 Angstroms and the Mg IX line at 368.1 Angstroms, both observed by CDS.

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