Center-to-limb observations of the lambda 285.2 NM MgI UV resonance line

Astronomy and Astrophysics – Astronomy

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Line Spectra, Magnesium, Resonance Lines, Ultraviolet Astronomy, Ultraviolet Spectra, Absorption Spectra, Doppler Effect, Emission Spectra, Solar Limb, Spatial Resolution, Spectral Resolution

Scientific paper

We present here new results about the 285.212 nm Mg I resonance line. The spectra have been obtained from the RASOLBA balloon experiment of the LPSP launched in 1986 from France. The data have both high spectral (1.5 pm) and spatial (1 sec) resolution. Spectra of either the Sun center and the solar limb have been recorded in the 280 nm range. We paid a careful attention on the spatial evolution of the Mg I absorption line with the hope to find predicted but not confirmed emission feature in the central core. The very faint emission detected at Sun center becomes bright when observed off-limb. We give some measurements of the Mg I core Doppler shifts.

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