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Observed variations of the solar photospheric diameter

Published online by Cambridge University Press:  26 February 2010

S. C. Boscardin ,
E. Reis Neto ,
J. Penna ,
A. R. Rodriguez Papa ,
A. H. Andrei  and
V. A. d'Ávila
S. C. Boscardin
Affiliation:
Observatório Nacional/MCT, R. Gal. Jose Cristino 77, Rio de Janeiro, Brazil email: sergio.boscardin@on.br
E. Reis Neto
Affiliation:
Observatório Nacional/MCT, R. Gal. Jose Cristino 77, Rio de Janeiro, Brazil email: sergio.boscardin@on.br
J. Penna
Affiliation:
Observatório Nacional/MCT, R. Gal. Jose Cristino 77, Rio de Janeiro, Brazil email: sergio.boscardin@on.br
A. R. Rodriguez Papa
Affiliation:
Observatório Nacional/MCT, R. Gal. Jose Cristino 77, Rio de Janeiro, Brazil email: sergio.boscardin@on.br UERJ-BR, Rio de Janeiro, Brazil
A. H. Andrei
Affiliation:
Observatório Nacional/MCT, R. Gal. Jose Cristino 77, Rio de Janeiro, Brazil email: sergio.boscardin@on.br Obs. do Valongo/UFRJ-BR, Rio de Janeiro, Brazil
V. A. d'Ávila
Affiliation:
Observatório Nacional/MCT, R. Gal. Jose Cristino 77, Rio de Janeiro, Brazil email: sergio.boscardin@on.br UERJ-BR, Rio de Janeiro, Brazil
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Abstract

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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.

Keywords

Sun: fundamental parametersgranulationflaresactivityradio radiation

References

Boscardin, S. C. 2005, Análise de Observações do Diâmetro no Contexto da Atividade Solar (Analysis of Observations of the Diameter in the context of the Solar Activity), MsC discertation held at Observatório do Valongo/Universidade Federal do Rio de Janeiro.Google Scholar
Boscardin, S. C., Andrei, A. H., Penna, J. L., Reis Neto, E., & d’Ávila, V. 2009, Solar diameter observed variation: the correlation to activity and the results from different stations, in preparation.Google Scholar
Jilinski, E. G., Puliaev, S. P., Penna, J. L., Andrei, A. H., & Laclare, F. 1998, Solar diameter observations with the astrolabe at Observatório Nacional - Rio de Janeiro, Astronomy and Astrophysics Supplement Series, 130, 317.CrossRefGoogle Scholar