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Mid-term Periodicities of the LYRA data spectrum

This study analyzes the mid-term periodicities present in the data spectrum of the PROBA2/LYRA radiometer, which observes the Sun in the UV-EUV range. The analysis compares the periodicities to other solar indices, such as sunspot number, 10.7 cm flux, X-ray flares indices, and daily sunspot areas. The study highlights several periodicities and their correlations to different datasets.

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Mid-term Periodicities of the LYRA data spectrum

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  1. Mid-term Periodicities of the LYRA data spectrum L.Wauters, M.Dominique and I.E DammasCh Solar Influences Data analysis Center – SIDC Solar-Terrestrial Centre of Excellence – STCE Royal observatory of Belgium PROBA2 Center

  2. Outline • PROBA2/LYRA is a UV-EUV radiometer that has observed the Sun in a quasi-uninterrupted way over the past five years with two EUV channels: the aluminum channel(1-80nm) and the zirconium channel (1-20nm). • We have analyzed the data produced by those two channels, looking for mid-term periodicities. • We have compared those periodicities to the ones observed in the sunspot number, 10.7 cm flux, X-Rays flares indices and Daily Sunspots areas. • The analysis of data spectrum was based on Lomb-Scargle periodograms. It has been compared to wavelet analysis results. • We highlight different periodicities present in the spectra. We are mainly interested in the common periodicities of all signals: ~54, ~59, ~100, ~150

  3. LYRA zirconium and Aluminium channelRange of date 2010-04-01,2014-04-30 99 95 50

  4. Periodicities Set of data: April 2010 until April 2014 * * * *

  5. Summary of periodicities Red: Wavelet transform, Blue: Lomb-Scargle periodogram

  6. Periodicities per cycle for the sunspots index and sunspots area Red: Sunspots area, Black: Sunspots Number

  7. Conclusions • We analyzed the spectral content of two LYRA channels (aluminum and zirconium channels). • We compared the LYRA spectra obtained to other solar indices representing the solar activity: the sunspots index, the 10.7 radio flux, but also the number of X-Ray flare events, the sunspots area. • LYRA spectra exhibit a similar behavior as the other ones. Such a good correlation reinforces the validity of our LYRA data. • Some periodicities are well described in the literature, like the 28 and 160-day (Rieger et al 1984) periods. Others have only been mentioned a couple of time. The fact that they can be clearly identified in our data is an argument in favor of their existence. • Four periodicities are visible in the various datasets for the cycle 24: ~54, ~59, ~100,~150. • The analysis of the Sunspot area and Sunspot number spectrum when covering the solar cycles 14-23 give the four main periodicities but also additional periodicities: 75,110,130 and 185

  8. To DO: • The analysis of periodicity amplitudes of the Sunspot area and Sunspot number when covering the solar cycles 14-23 could be interesting. • Analysis of periodicitieswith time windows of different sizes. Check the evolution of periodicitieswith time and withwindow size. • Analysis of the periodicities ~59 and ~130, which are alsofound by M.Mefta and al. at Latmos (PROBA2 GI). • SWAP intensity analysis.

  9. Sunspot index spectrum

  10. F10.7 cm Flux spectrum

  11. Flares index spectrum

  12. Sunspot area spectrum

  13. Cycles

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