Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994exa.....4..253k&link_type=abstract
Experimental Astronomy (ISSN 0922-6435), vol. 4, no. 3-4, p. 253-263
Astronomy and Astrophysics
Astronomy
Atmospheric Attenuation, Atmospheric Scattering, Earth Atmosphere, Helioseismology, Photometers, Solar Oscillations, Solar Radio Emission, Doppler Effect, Iris Satellites, Solar Rotation
Scientific paper
The ground based full disk velocity doppler measurements used in helioseismology suffer from an atmospheric noise component when the sky transparency is not perfect. It is due to the non uniform integration of the line of sight component of the solar rotation produced by the differential atmospheric extinction across the direction of the solar equator. A simple two-channel differential photometer is proposed for measuring this differential extinction. The first laboratory tests of this instrument show that it has the capability of performing the required correction without adding a significant level of new instrumental noise contribution.
Fossat Eric
Khatami M.
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