Solar Rotation During the Period 1847 - 1849

Details Solar Rotation During the Period 1847 - 1849 Solar Rotation During the Period 1847 - 1849

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010soph..261....1s&link_type=abstract

Solar Physics, Volume 261, Issue 1, pp.1-9

Physics

W.C. Bond, Historical Sunspot Drawings, Solar Rotation Rate, 19Th Century

Scientific paper

Solar rotation rate has been measured using the sunspot positions recorded by W.C. Bond during the period 1847 - 1849 at the Harvard College Observatory. From the drawings carried out by Bond we have selected the sunspots and groups of sunspots with more reliable positions presented in three or more drawings on successive days. We have calculated from the positions of the selected sunspots (41 in total) a synodic rotation rate of ω=[(12.92±0.08)-(1.5±1.0)sin 2 φ] degrees/day, where φ is the heliographic latitude. This rate, although slightly lower, is similar to the actual solar rotation rate, confirming no important changes in the solar rotation during the last 160 years.

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