Total sunspot area as a solar activity index

Author： Sarychev A.   Roshchina E.  

Publisher： MAIK Nauka/Interperiodica

ISSN： 0038-0946

Source： Solar System Research, Vol.40, Iss.6, 2006-12, pp. : 521-526

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

Observational time series of the total sunspot area A in the visible solar hemisphere are analyzed. A technique that allows the instability of the scale of these series to be found and corrected has been developed. An internally homogeneous series of the index A on the Greenwich scale can be obtained from 1875 to the present. A method for the approximate calculation of the yearly mean A from the Wolf sunspot numbers known since 1700 is suggested to extend this series into the past. The resulting series of the index A characterizes the solar activity variations over a period of ∼300 years. These data are used to study processes in the Solar System related to the variability of the central star.

Related content

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

By Nagovitsyn Yu.  

Astronomy Letters, Vol. 31, Iss. 8, 2005-08 ,pp. : 557-562 (6)

MAIK Nauka/Interperiodica

Access to resources Recommend Favorite

Total sunspot area before 1875 (reconstruction)

By Sarychev A.   Roshchina E.  

Solar System Research, Vol. 41, Iss. 3, 2007-06 ,pp. : 256-263 (8)

MAIK Nauka/Interperiodica

Access to resources Recommend Favorite

From Sunspot Area to Solar Variability: A Linear Transformation

By Preminger Dora   Walton Stephen  

Solar Physics, Vol. 240, Iss. 1, 2007-01 ,pp. : 17-23 (7)

Springer Publishing Company

Access to resources Recommend Favorite

Group Sunspot Numbers: A New Solar Activity Reconstruction

By Hoyt D.V.   Schatten K.H.  

Solar Physics, Vol. 181, Iss. 2, 1998-08 ,pp. : 491-491 (1)

Springer Publishing Company

Access to resources Recommend Favorite

Group Sunspot Numbers: A New Solar Activity Reconstruction

By Hoyt D.V.   Schatten K.H.  

Solar Physics, Vol. 179, Iss. 1, 1998-04 ,pp. : 189-219 (31)

Springer Publishing Company

Access to resources Recommend Favorite