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2005•Astronomy LettersRequires access

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

Yu. A. Nagovitsyn

Open publisher page 42 citations

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.

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What this paper is about

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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Available 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.

Key concepts: Sunspot, Sunspot number, Physics, Series (stratigraphy), Term (time), Solar cycle 22, Flux (metallurgy), Astrophysics

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