Calculation of pseudo narrow band oscillations produced by atmospheric differential extinction.
Abstract
It is suggested that diurnal effects due to the atmospheric transparency may give rise to systematic drift in solar Doppler measurements. The effect of differential atmospheric transparency on measurements is investigated. It is shown to favour harmonic 8, 9, and 10 for measurement durations from 4 to 10 h. This effect can explain an amplitude close to 1 m/s for these harmonics, and also the appearance of phase coherence over long time periods.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- August 1979
- Bibcode:
- 1979A&A....77..351G
- Keywords:
-
- Atmospheric Optics;
- Doppler Effect;
- Solar Oscillations;
- Solar Spectra;
- Bandwidth;
- Diurnal Variations;
- Harmonic Analysis;
- Transparence;
- Solar Physics;
- Absorption:Earth Atmosphere