The solar rotation 1883 until 1893 as inferred from the Greenwich Photoheliographic Results and observations published by G. Spoerer

Details The solar rotation 1883 until 1893 as inferred from the Greenwich Photoheliographic Results and observations published by G. Spoerer The solar rotation 1883 until 1893 as inferred from the Greenwich Photoheliographic Results and observations published by G. Spoerer

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...219..313w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 219, no. 1-2, July 1989, p. 313-316.

Astronomy and Astrophysics

Astrophysics

4

Solar Rotation, Spectroheliographs, Sunspots, Solar Observatories, Winter

Scientific paper

The finding that the solar rotation velocity inferred from the Greenwich Photoheliographic Results (GPR) as compared to that from observations published by G. Spoerer for the years 1883 until 1893 shows a difference of the order of 0.1 deg/day is investigated in some details. An analysis of rotation velocities of stable sunspots, which are covered sufficiently by observations in both sets of data, yields no significant differences. The mean difference is nearly two orders of magnitude below the above cited value. The explanation of the difference is the presence of more short-living sunspots in the GPR, which show a more rapid rotation velocity. There are about twice as many days without any spot observations in the publications of Spoerer as compared to the GPR. Some indications are presented, that the solar behavior changed after the begining of our century.

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