000004784 001__ 4784
000004784 005__ 20200210134310.0
000004784 037__ $$aPOSTER-2020-0060
000004784 100__ $$aWauters, Laurence
000004784 245__ $$aEvolution of periodicities with solar cycle for long-term solar time series
000004784 260__ $$c2019
000004784 269__ $$c2019-11-18
000004784 520__ $$aThe periodograms of the spacial PROBA2/LYRA data show predominant periodicities comparable to the ones observed by other solar time series for the same time range. These periodicities have been found to slightly vary over time. Tracking their evolution on a long-term basis aims at identifying which periodicities are related to each other and at determining which physical processes are at their origin. A study has been made on ground based sunspot area (total and hemispheric), for which several solar cycles of data exist and for which the periodicities are close to the ones found in PROBA2/LYRA (for the same time range).  We used framed Lomb-Scargle periodograms to extract the periodicities and check their evolution. Several significant periodicities behave similarly  and seem to be harmonics of each other. The differential solar rotation and the magnetic solar cycle are highlighted by the results.
000004784 536__ $$aPRO-SIDC/$$cPRO-SIDC/$$fPRO-SIDC
000004784 594__ $$aNO
000004784 700__ $$aDominique, Marie
000004784 700__ $$aDammash, Ingolf I.E
000004784 700__ $$aMeftah, Mustafa
000004784 773__ $$tESWW16, Liège
000004784 8560_ $$flaurence.wauters@observatoire.be
000004784 85642 $$ahttps://register-as.oma.be/esww16/contributions/public/S3-P1/S3-P1-28-WautersLaurence/ESWW16_LW.pptx
000004784 980__ $$aCPOSTER