The HeII (and DI) Lines in the Lyman Series of Solar Prominences

Physics

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Scientific paper

The hydrogen lines are the most prominent lines in solar prominence spectra. Observations with the SUMER spectrometer on board SoHO showed that there are weak emission lines in the blue wings of the Lyman series which affect their profiles. We identified them as D I and He II lines in the Lyman alpha profile and He II lines in the upper Lyman series wings. The He II lines are identified as Balmer lines of He II. We attempt to characterize these lines in the blue wings of the Lyman series and consequently to provide supplementary He II information for further He I-He II non-LTE modelling.

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