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Venus transit, aureole and solar diameter

Published online by Cambridge University Press:  18 July 2013

Wenbin Xie ,
Costantino Sigismondi ,
Xiaofan Wang  and
Paolo Tanga
Wenbin Xie*
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences
Costantino Sigismondi
Affiliation:
ICRA/Sapienza Università di Roma, Ateneo Pontificio Regina Apostolorum, email: sigismondi@icra.it
Xiaofan Wang*
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences
Paolo Tanga
Affiliation:
Observatoire de la Côte d'Azur, email: paolo.tanga@oca.eu
*
aemail: wb_xie@bao.ac.cn
bwxf@nao.cas.cn
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Abstract

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The possibility to measure the solar diameter using the transits of Mercury has been exploited to investigate the past three centuries of its evolution and to calibrate these measurements made with satellites. This measurement basically consists to compare the ephemerides of the internal contact timings with the observed timings. The transits of Venus of 2004 and 2012 gave the possibility to apply this method, involving a planet with atmosphere, with the refraction of solar light through it creating a luminous arc all around the disk of the planet. The observations of the 2012 transit made to measure the solar diameter participate to the project Venus Twilight Experiment to study the aureole appearing around it near the ingress/egress phases.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 485 - 486
Copyright
Copyright © International Astronomical Union 2013 

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