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Title:
Observed variations of the solar photospheric diameter
Authors:
Boscardin, S. C.; Neto, E. Reis; Penna, J.; Rodriguez Papa, A. R.; Andrei, A. H.; d'Ávila, V. A.
Affiliation:
AA(Observatório Nacional/MCT, R. Gal. Jose Cristino 77, Rio de Janeiro, Brazil ), AB(Observatório Nacional/MCT, R. Gal. Jose Cristino 77, Rio de Janeiro, Brazil ), AC(Observatório Nacional/MCT, R. Gal. Jose Cristino 77, Rio de Janeiro, Brazil ), AD(Observatório Nacional/MCT, R. Gal. Jose Cristino 77, Rio de Janeiro, Brazil ; UERJ-BR, Rio de Janeiro, Brazil ), AE(Observatório Nacional/MCT, R. Gal. Jose Cristino 77, Rio de Janeiro, Brazil ; Obs. do Valongo/UFRJ-BR, Rio de Janeiro, Brazil ), AF(Observatório Nacional/MCT, R. Gal. Jose Cristino 77, Rio de Janeiro, Brazil ; UERJ-BR, Rio de Janeiro, Brazil )
Publication:
Solar and Stellar Variability: Impact on Earth and Planets, Proceedings of the International Astronomical Union, IAU Symposium, Volume 264, p. 72-74
Publication Date:
02/2010
Origin:
CUP
Keywords:
Sun: fundamental parameters, granulation, flares, activity, radio radiation
DOI:
10.1017/S1743921309992390
Bibliographic Code:
2010IAUS..264...72B

Abstract

Here we derive a formulation connecting the observed variations of the solar diameter to the heliophysics of the photosphere, in particular in connection to the granulation pattern and morphology. The results from the measurements are next used to correlate the variations of the semi-diameter and of estimators of the solar activity along the solar cycle 23. The values obtained strongly support a broader physical description of the photosphere, intertwining the diameter variations with the irradiance, the sunspots, the 10.7 cm radio emission, and to a lesser degree with the integrated magnetic field and with the flares count.

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