Analysis of Diameter Measurements Performed at Calern Observatory Astrolabe

Creators: Moussaoui, Rachid; Irbah, Abdanour; Abdelatif, Toufik; Fossat, Eric; Borgnino, Julien; Laclare, Francis; Delmas, Christian

Others:: Centre de Recherche en Astronomie Astrophysique et Géophysique (CRAAG); Laboratoire Universitaire d'Astrophysique de Nice (LUAN) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS); Observatoire de la Côte d'Azur (OCA) ; Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS); Département C.E.R.G.A (O.C.A) ; Ministère de l'Education nationale, de l'Enseignement supérieur et de la Recherche (M.E.N.E.S.R.)

Description

Solar diameter measurements performed at Calern Observatory astrolabe during more than two solar cycles show variations at various time scales in a broad range. Due to seasonal effects and instrumental characteristics, the recorded data are not sampled uniformly and present some gaps during these years. This time series has been analyzed by means of a deconvolution of the window function, as an alternative method to the standard least square fits of harmonic functions. The results show an extremely important improvement of the power spectrum. Harmonic terms already found by other authors are confirmed but new frequencies are also revealed by this analysis.

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Analysis of Diameter Measurements Performed at Calern Observatory Astrolabe

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Abstract

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