Abstract
The spectra of the PROBA2/LYRA data, similarly to every other solar time series, show predominant periodicities that can be of solar or instrumental origin. In this article, we compare the main periodicities characterizing the LYRA spectrum to those found in the sunspot number, in the 10.7 cm flux, in an X-ray flare index, and in the sunspot area evolution. We focused on the 2010 to 2014 time range, for which the LYRA data are available, although we also briefly address the evolution of the main periodicities in the longer range. The mid-term periodicities at \({\sim}\,28\), \({\sim}\,44\), \({\sim}\,54\), \({\sim}\,59\), \({\sim}\,100\), \({\sim}\,110\), and \({\sim}\,150\) days appear as highly significant in several analyzed datasets. The consistency of distinct periodicities between datasets provides characteristics for the global Sun. This consistency also strengthens the reliability of LYRA data.
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Acknowledgement
LYRA is a project of the Centre Spatial de Liege, the Physikalisch-Meteorologisches Observatorium Davos and the Royal Observatory of Belgium funded by the Belgian Federal Science Policy Office (BELSPO) and by the Swiss Bundesamt fur Bildung und Wissenschaft. We acknowledge WDC-SILSO for the Daily Sunspot Number data, the Royal Observatory of Belgium, Brussels and NGDC for other solar data. The wavelet software provided by C. Torence and G. Campo is also acknowledged. We wish to express our gratitude to D. Berghmans for internally reviewing our paper. We also wish to express our gratitude to S. Willems for her help in the plot design. The authors acknowledge the support from the Belgian Federal Science Policy Office through the ESA-PRODEX programme, the Solar-Terrestrial Center of Excellence, as well as the Belgian Network CHARM (Contemporary physical challenges in Heliospheric and AstRophysical Models, IAP P07/08).
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Appendix
Appendix
Lomb–Scargle periodograms obtained for the sunspot number and F10.7. The periodicities (abscissa) are plotted in days. Three levels of significance are drawn (straight lines) at 50, 95, and 99 %.
Lomb–Scargle periodograms obtained for the flare index and the sunspot area. The periodicities (abscissa) are plotted in days. Three levels of significance are drawn (straight lines) at 50, 95, and 99 %.
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Wauters, L., Dominique, M. & Dammasch, I.E. LYRA Mid-Term Periodicities. Sol Phys 291, 2135–2144 (2016). https://doi.org/10.1007/s11207-016-0960-8
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DOI: https://doi.org/10.1007/s11207-016-0960-8