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In-depth survey of sunspot and active region catalogs

Published online by Cambridge University Press:  26 August 2011

Laure Lefèvre
Affiliation:
Royal Observatory of Belgium, 3 Avenue Circulaire, 1180, Uccle, Belgium email: laure.lefevre@oma.be and frederic.clette@oma.be
Frédéric Clette
Affiliation:
Royal Observatory of Belgium, 3 Avenue Circulaire, 1180, Uccle, Belgium email: laure.lefevre@oma.be and frederic.clette@oma.be
Tunde Baranyi
Affiliation:
Heliophysical Observatory of the Hungarian Academy of Sciences, H-4010 Debrecen, Hungary email: baranyi@tigris.unideb.hu
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Abstract

When consulting detailed photospheric catalogs for solar activity studies spanning long time intervals, solar physicists face multiple limitations in the existing catalogs: finite or fragmented time coverage, limited time overlap between catalogs and even more importantly, a mismatch in contents and conventions. In view of a study of new sunspot-based activity indices, we have conducted a comprehensive survey of existing catalogs.

In a first approach, we illustrate how the information from parallel catalogs can be merged to form a much more comprehensive record of sunspot groups. For this, we use the unique Debrecen Photoheliographic Data (DPD), which is already a composite of several ground observatories and SOHO data, and the USAF/Mount Wilson catalog from the Solar Optical Observing Network (SOON). We also describe our semi-interactive cross-identification method, which was needed to match the non-overlapping solar active region nomenclature, the most critical and subtle step when working with multiple catalogs. This effort, focused here first on the last two solar cycles, should lead to a better central database collecting all available sunspot group parameters to address future solar cycle studies beyond the traditional sunspot index time series Ri.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2011

References

NGDC website: http://www.ngdc.noaa.gov/Google Scholar
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