Physics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991javso..20...98t&link_type=abstract
The Journal of the American Association of Variable Star Observers, vol. 20, no. 1, p. 98-100
Physics
1
Scientific paper
Final values of American Relative Sunspot Numbers for 1990 are provided.
The values are based upon observations made by contributors to the AAVSO
Solar Division's international network.
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