Photospheric lines redshift from balloon ultraviolet spectra of the quiet Sun

Physics

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Oxygen, Photosphere, Red Shift, Solar Physics, Telluric Lines, Ultraviolet Spectra, Balloons, Convection, Data Processing, Earth Atmosphere, Schumann-Runge Bands, Ultraviolet Radiation

Scientific paper

Wavelength shifts between solar photospheric lines observed in two quiet areas of the Sun and telluric O2 absorption lines of the Schulman-Runge bands were measured in the 1950 to 2000 A region. The results are deduced from high resolution spectra taken on board a balloon experiment at an altitude of 39 km. They show a systematic redshift of the solar lines relative to the reference telluric spectrum. After correction for the gravitational redshift and for all the known relative motions between Sun and observer, the average residual value is +7 mA, that corresponds in terms of velocity to an equivalent Doppler-Fizeau shift on the whole spectrum of about 1 km/s away from the observer. Whether the redshift has a solar origin or the O2 telluric lines are blueshifted in the terrestrial atmosphere is considered

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