Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316..819l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 316, May 15, 1987, p. 819-825.
Astronomy and Astrophysics
Astrophysics
14
Calcium, Solar Flares, Solar Spectra, Ultraviolet Spectra, Beryllium, Carbon, Ion Distribution, Nitrogen, Oxygen, Tokamak Devices
Scientific paper
Calcium was introduced into the TEXT tokamak, and its spectral emission was recorded in the 50-360 A range by an absolutely calibrated grazing incidence spectrometer. These observations of highly ionized species of calcium at known conditions of plasma electron temperature and density allow testing of line brightness ratio predictions based on theoretical values of temperature-dependent electron excitation rates. The confirmation of the expected ratios in Be I-like to O I-like calcium allows more confident use of these ratios as a density diagnostic of remote astrophysical sources such as solar flares.
Bhatia Anand K.
Finkenthal Michael
Huang L. K.
Lippmann S.
Moos Warren H.
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