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The new Sunspot Number: continuing upgrades and possible impacts

Published online by Cambridge University Press:  27 November 2018

Frédéric Clette Open the ORCID record for Frédéric Clette [Opens in a new window]  and
Laure Lefèvre
Frédéric Clette
Affiliation:
Royal Observatory of Belgium 3, avenue Circulaire, 1180 Brussels, Belgium email: [email protected]
Laure Lefèvre
Affiliation:
Royal Observatory of Belgium 3, avenue Circulaire, 1180 Brussels, Belgium email: [email protected]
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Abstract

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The first-ever revision of the sunspot number was released in 2015 by the World Data Center (WDC) SILSO. We describe the main diagnosed corrections to the sunspot and group number series, and also review newly published alternate reconstructions. We show the convergence of the determinations of the 1947 scale jump in the sunspot number around a value of 1.18 for cycle maxima. We also assess new proposed reconstructions of the group number, like the “backbone” and “active-day fraction” methods. No agreement was reached yet for this series.

We highlight the main impacts of those recent upgrades on different scientific applications. As this first revision also marks a transition towards a dynamical series open to future improvements, we finally introduce the ongoing collaborative process for preparing the next upgrade (Version 3). From now on, our scientific users must be prepared for a flexible integration of an evolving sunspot number series.

Keywords

Sun: sunspotsSun: photosphereSun: activitymethods: data analysis
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S340: Long-term Datasets for the Understanding of Solar and Stellar Magnetic Cycles , February 2018 , pp. 17 - 22
Copyright
Copyright © International Astronomical Union 2018 

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