Analysis of Diameter Measurements Performed at Calern Observatory Astrolabe |
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| Authors: | Moussaoui R Irbah A Abdelatif T Fossat E Borgnino J Laclare F Delmas C |
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| Institution: | (1) Observatoire d'Alger, C.R.A.A.G, BP63 Bouzaréah, 16340 Alger, Algérie;(2) UMR n° 6525 Astrophysique, Parc Valrose, Université de Nice-Sophia Antipolis, F-06108 Nice Cedex 2, France;(3) Dpt. C.E.R.G.A, Observatoire de la Côte d'Azur, Avenue Copernic, F-06130 Grasse, France |
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| Abstract: | 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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