A Normalized Sunspot-Area Series Starting in 1832: an Update
arXiv:1606.04280 · doi:10.1007/s11207-016-0943-9
Abstract
A new normalized sunspot-area series has been reconstructed from the series obtained by the Royal Greenwich Observatory and other contemporary institutions for the period 1874 - 2008 and the area series compiled by De la Rue, Stewart, and Loewy from 1832 to 1868. Since the two sets of series do not overlap in time, we used as a link between them the new version of sunspot index number (Version 2) published by SILSO (Sunspot Index and Long-term Solar Observations). We also present a spectral analysis of the normalized area series in search of periodicities beyond the well-known solar cycle of 11 years and a study of the Waldmeier effect in the new version of sunspot-number and the sunspot-area series presented in this study. We conclude that while this effect is significant in the new series of sunspot number, it has a weak relationship with the sunspot-area series.
16 pages, 5 figures, to be published in Solar Physics
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Cited by in corpus (9)
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- Temporal and Spatial Evolutions of a Large Sunspot Group and Great Auroral Storms around the Carrington Event in 1859
- The Great Space Weather Event during February 1872 Recorded in East Asia
- Scrutinizing the relationship between plage areas and sunspot areas and numbers
- Average annual total sunspot area in the last 410 years: The most probable values and limits of their uncertainties
- Soonspot: Software to Determine Areas and Sunspot Positions
- A Sunspot Catalog for the Period 1952-1986 from Observations Made at the Madrid Astronomical Observatory
- Revisiting the prediction of solar activity based on the relationship between the solar maximum amplitude and max-max cycle length
- Evaluation of Sunspot Areas Derived by Automated Sunspot-Detection Methods