Dependence of the He/H8 emission ratio on brightness, temperature, and structuring of prominences
Abstract
We investigate the dependence of the He/H8 emission ratio on kinetic temperature and total Balmer brightness. The line pair He\, i\,3888\, and H8\,3889 has been observed simultaneously with the Ca II 8498 line in a number of quiescent prominences. The He/H8 emission ratio R is found to cover defined parts of a general anti-relation with the total H8 emission, depending on the kinetic temperature, Tkin, of the individual prominence: High H8 brightness is related to small R and Tkin values, and preferably occurs in prominences with a less significant fine-structure.
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