To the Description of Long-Term Variations in the Solar Magnetic Flux: The Sunspot Area Index

Details To the Description of Long-Term Variations in the Solar Magnetic Flux: The Sunspot Area Index To the Description of Long-Term Variations in the Solar Magnetic Flux: The Sunspot Area Index

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005astl...31..557n&link_type=abstract

Astronomy Letters, vol. 31, Issue 8, p.557-562

Astronomy and Astrophysics

Astronomy

16

Sun - Solar Activity

Scientific paper

We show that the Wolf sunspot numbers W and the group sunspot numbers GSN are physically different indices of solar activity and that it is improper to compare them. Based on the approach of the so-called “primary” indices from the observational series of W(t) and GSN(t), we suggest series of yearly mean sunspot areas beginning in 1610 and monthly mean sunspot areas beginning in 1749.

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