Daily variations of the photospheric equatorial rotation velocity of the sun and its absolute values in 1981 and 1982 as determined from measurements using a two-dimensional photodiode array

Details Daily variations of the photospheric equatorial rotation velocity of the sun and its absolute values in 1981 and 1982 as determined from measurements using a two-dimensional photodiode array Daily variations of the photospheric equatorial rotation velocity of the sun and its absolute values in 1981 and 1982 as determined from measurements using a two-dimensional photodiode array

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123...29k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 1, June 1983, p. 29-32. Sponsorship: Deutsche Forschungsgemeinschaft.

Astronomy and Astrophysics

Astrophysics

17

Angular Velocity, Photodiodes, Photosphere, Solar Rotation, Diurnal Variations, Doppler Effect, Velocity Measurement

Scientific paper

Doppler velocity measurements using the solar spectral line Fe I 6301.5 Å and the terrestrial O2 line at 6302.0 Å as a reference were used to determine the equatorial rotation velocity of the solar photosphere. The spectral lines were recorded by a two-dimensional photodiode array.
The absolute values of the rotation velocity were 1988 m/s in April 1981 and 1953 m/s in May 1982. The daily variations did not exceed 10 m/s when time averages of several hours existed.
The comparison with results from other observes and other observatories shows the same behaviour from 1981 to 1982: a decrease of the rotation velocity by about 35 m/s. But neither the absolute values nor the daily changes are in good agreement with other observations.

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