Abstract
We examine the background velocity fields of the Sun as observed at Mount Wilson. The method of velocity reduction of the full-disk Mount Wilson data is outlined. We describe a number of tests that have been carried out in order to find an instrumental origin for short-term rotation variations and a large-scale background line-shift - the ears. No instrumental cause can be found for this ear effect, although such a cause cannot yet be ruled out.
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Operated jointly by the Carnegie Institution of Washington and the California Institute of Technology.
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Howard, R., Boyden, J.E. & Labonte, B.J. Solar rotation measurements at Mount Wilson. Sol Phys 66, 167–185 (1980). https://doi.org/10.1007/BF00150527
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DOI: https://doi.org/10.1007/BF00150527