Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...222..361a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 222, no. 1-2, Sept. 1989, p. 361-366. Research supported by CNES.
Astronomy and Astrophysics
Astrophysics
5
Helioseismology, Optimization, Radial Velocity, Solar Oscillations, Velocity Measurement, Calibrating, Noise Reduction, Optical Filters, Optical Measuring Instruments, Spectral Sensitivity
Scientific paper
Solar-oscillation instruments have many common characteristics, such as detecting solar radial velocities on Fraunhofer lines with a 2-point measuring technique, high spectral resolution and stability, etc. The 2-point measuring technique is described including spectral responses of filter and blocker, calibration, sensitivity and photon noise. Optimization of different parameters such as filter profile, filter bandwidth, filter scanning range, line profile, line depth and prefilter bandwidth is addressed by means of a simple model. This analysis is then applied to existing or future helioseismology instruments.
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