Comparison of the differential rotation laws and meridional motions determined from sunspot positions taken from the Greenwich Photoheliographic Results, the drawings of G. Spoerer, and the Kanzelhoehe data

Details Comparison of the differential rotation laws and meridional motions determined from sunspot positions taken from the Greenwich Photoheliographic Results, the drawings of G. Spoerer, and the Kanzelhoehe data Comparison of the differential rotation laws and meridional motions determined from sunspot positions taken from the Greenwich Photoheliographic Results, the drawings of G. Spoerer, and the Kanzelhoehe data

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...203..381b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 203, no. 2, Sept. 1988, p. 381-384.

Astronomy and Astrophysics

Astrophysics

11

Angular Velocity, Solar Rotation, Sunspots, Error Analysis, Solar Cycles

Scientific paper

A comparison of the solar rotation velocities derived from the Greenwich Photoheliographic Results (GPR) and from Sporer's observations for the period 1883-1893 and from the Kanzelhohe data for 1948-1976 is presented. Although there is a good agreement of the results from Sporer's data with those from the modern GPR, it cannot be surely excluded that the decrease of the rotation velocity of the GPR during the early 20th century is of solar origin. But the comparison of the rotation velocities of recurrent groups determined from the individual positions during two passages and from the central meridian transits yield hints that systematical effects are present in the old GPR and in the Kanzelhohe data. A comparison of the meridional motions determined from Sporer's data and from the GPR yields no significant difference.

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