Straylight influence on measurements of solar velocity oscillations

Details Straylight influence on measurements of solar velocity oscillations Straylight influence on measurements of solar velocity oscillations

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mmsai..55..345a&link_type=abstract

(European Physical Society, Ministero della Pubblica Istruzione, and Universita di Catania, EPS Study Conference on Oscillations

Astronomy and Astrophysics

Astronomy

2

Solar Oscillations, Solar Velocity, Doppler Effect, Solar Limb, Solar Spectra, Velocity Measurement

Scientific paper

Doppler measurements of solar velocity oscillations with apertures without axial symmetric averaging will be strongly influenced by the long range straylight (scattering) and its time variation. The corresponding error signal is of the same magnitude as the global velocity oscillation signal. For spectral lines with a large limb effect, the straylight will also introduce appreciable errors in observations performed with axisymmetric apertures (e.g., Stanford and the Crimea) as well as in full disk measurements. Time variations in the scattering will introduce quasi-periodic velocity components with both daily and seasonal periods.

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