, Volume 31, Issue 8, pp 557-562

To the description of long-term variations in the solar magnetic flux: The sunspot area index

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

Abstract

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.

__________
Translated from Pis’ma v Astronomicheski \(\overset{\lower0.5em\hbox{\(\smash{\scriptscriptstyle\smile}\)}}{l} \) Zhurnal, Vol. 31, No. 8, 2005, pp. 622–627.
Original Russian Text Copyright © 2005 by Nagovitsyn.