Definitive American Relative Sunspot Numbers for 1989

Details Definitive American Relative Sunspot Numbers for 1989 Definitive American Relative Sunspot Numbers for 1989

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989javso..18..143t&link_type=abstract

The Journal of the American Association of Variable Star Observers. vol. 18, no. 2, p. 143-145

Physics

2

Scientific paper

Final values of American Relative Sunspot Numbers for 1989 are provided.
The values are based on observations made by members of the
international network of American Sunspot Program collaborators and the
AAVSO Solar Division.

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