LYRA Mid-Term Periodicities

• Published in: Solar physics Vol. 291; no. 7; pp. 2135 - 2144
• Main Authors: Wauters, L., Dominique, M., Dammasch, I. E.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01-08-2016; Springer Nature B.V
• Subjects: Astrophysics and Astroparticles; Atmospheric Sciences; Consistency; Evolution; Flares; Flux; Physics; Physics and Astronomy; Radiometers; Solar cycle; Solar physics; Space Exploration and Astronautics; Space Sciences (including Extraterrestrial Physics; Spectra; Sunspots; Texts; Time series; Sunspot Area; Flare; Sunspot Number; Fundamental Period; Solar Cycle
• ISSN: 0038-0938; 1573-093X
• DOI: 10.1007/s11207-016-0960-8

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
∼
28
,
∼
44
,
∼
54
,
∼
59
,
∼
100
,
∼
110
, and
∼
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.