A comprehensive search for sunspots without the aid of a telescope, 1981-1982

Details A comprehensive search for sunspots without the aid of a telescope, 1981-1982 A comprehensive search for sunspots without the aid of a telescope, 1981-1982

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989qjras..30...59m&link_type=abstract

Royal Astronomical Society, Quarterly Journal (ISSN 0035-8738), vol. 30, March 1989, p. 59-64.

Astronomy and Astrophysics

Astronomy

13

Astronomy, Solar Activity, Sunspots, Telescopes, Clouds, Fog, Haze, Sun

Scientific paper

Results are presented from a daily sunspot survey conducted in Crosby, UK between February 1, 1981 and Febrary 28, 1982. It is found that spots or spot groups as small as 0.4 arcmin can be detected without the aid of a telescope. A total of 278 spots or spot groups corresponding to 72 long-lived active regions were observed. It is shown that periods of high sunspot activity are visible to the naked eye, suggesting that ancient Chinese observations of solar activity might be accurate.

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