view Abstract Citations (67) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A possible variation of the solar rotation with the activity cycle. Howard, R. Abstract Daily spectroscopic observation of the rotation of the sun indicates that several slow changes have taken place since 1967. The equatorial rotation rate of the photospheric gas has gradually increased until, in 1976, it is close to the sunspot rate determined by Newton and Nunn (1951). The latitude gradient at middle latitudes decreased starting in 1974, and the latitude gradient at high latitudes has increased in the same interval. An increase in the number of low-latitude active regions may be responsible for accelerating the photospheric gas. Publication: The Astrophysical Journal Pub Date: December 1976 DOI: 10.1086/182328 Bibcode: 1976ApJ...210L.159H Keywords: Solar Activity; Solar Rotation; Sunspot Cycle; Error Analysis; Latitude; Lines Of Force; Magnetic Signatures; Photosphere; Solar Magnetic Field; Solar Spectra; Solar Physics full text sources ADS |