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Solar limb darkening function and solar diameter with eclipse observations

Published online by Cambridge University Press:  27 June 2012

M. Faurobert ,
C. Fang ,
T. Corbard ,
A. Raponi ,
C. Sigismondi ,
K. Guhl ,
R. Nugent  and
A. Tegtmeier
A. Raponi
Affiliation:
Sapienza University of Rome, Italy. e-mail: andr.raponi@gmail.com
C. Sigismondi
Affiliation:
Sapienza University of Rome and ICRA, Italy; University of Nice-Sophia Antipolis, France; IRSOL and GPA-Observatorio Nacional Rio de Janeiro, Brazil
K. Guhl
Affiliation:
IOTA, International Occultation Timing Association
R. Nugent
Affiliation:
IOTA, International Occultation Timing Association
A. Tegtmeier
Affiliation:
IOTA, International Occultation Timing Association
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Abstract

We introduce a new method to perform high resolution astrometry of the solar diameter from the ground, through the observations of eclipses. A discussion of the solar diameter and its variations is linked to the Limb Darkening Function (LDF) using the luminosity evolution of a Baily’s Bead and the profile of the lunar limb available from satellite data. The inflexion point of the LDF is defined as the solar limb. The method proposed is applied for the videos of the eclipse in January, 15, 2010 recorded by Richard Nugent in Uganda and Andreas Tegtmeier in India. An upper limit for the inflexion point position has been set for that eclipse.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 55: 4th French-Chinese Meeting on Solar Physics - Understanding Solar Activity: Advances and Challenges , 2012 , pp. 389 - 391
Copyright
© EAS, EDP Sciences 2012

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References

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