Forbidden CA II in the sun unmasked by way of Venus

Physics

Scientific paper

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Abundance, Calcium, Forbidden Bands, Solar Spectra, Spectral Line Width, Venus (Planet), Absorption Spectra, Astronomical Models, Atmospheric Composition, Doppler Effect, Frequency Shift, Metal Ions, Solar Atmosphere

Scientific paper

Eleven high dispersion spectra of Venus, taken with blue Doppler shifts,
have been used to unmask the 7323.88 angstrom forbidden line of Ca II
from the earth atmospheric H2O absorption line at 7323.972 angstroms. An
equivalent width for the Ca II line has been obtained in integrated
sunlight. A model giving the solar calcium abundance is presented.

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