Terrestrial O2 lines used as wavelength references - Comparison of measurements and model computations

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Models, Oxygen Spectra, Radiosondes, Solar Spectra, Solar Wind Velocity, Atmospheric Effects, Doppler Effect, Line Spectra, Spectrum Analysis

Scientific paper

High precision spectral measurements of the wavelength of terrestrial O2 lines within solar spectra using the Kitt Peak 1-m Vacuum Fourier Transform Spectrometer are compared with model computations of the shifts of these lines due to wind up to 20 km. Although the wind data available existed only from radio sonde measurements about 65 km away and only from two launches per day, the shifts observed during two days could be explained well. Maximum shifts of terrestrial O2 lines of + or - 0.3 mA at about 6300 A were observed. It is shown that it may be possible to correct a general trend of the observed shifts with a precision of + or - 3 m/sec during a day.

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