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Measurements of the Apparent Solar Diameter with Astrolabe at Observatório Nacional—1997/2000

Published online by Cambridge University Press:  13 May 2016

A. H. Andrei ,
E. Reis Neto ,
J. L. Penna ,
W. G. de Almeida ,
V. A. d'Ávila ,
S. P. Puliaev  and
E. G. Jilinski
A. H. Andrei
Affiliation:
Observatório Nacional, R. Gal. José Cristino 77, RJ, Brazil
E. Reis Neto
Affiliation:
Observatório Nacional, R. Gal. José Cristino 77, RJ, Brazil
J. L. Penna
Affiliation:
Observatório Nacional, R. Gal. José Cristino 77, RJ, Brazil
W. G. de Almeida
Affiliation:
Observatório Nacional, R. Gal. José Cristino 77, RJ, Brazil
V. A. d'Ávila
Affiliation:
Observatório Nacional, R. Gal. José Cristino 77, RJ, Brazil
S. P. Puliaev
Affiliation:
Observatório Nacional, Brazil and Pulkovo Observatory, Russia
E. G. Jilinski
Affiliation:
Observatório Nacional, Brazil and Pulkovo Observatory, Russia

Abstract

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The metrological qualities render the modified CCD solar astrolabe a very reliable instrument for the difficult conditions of solar diameter measurements. At O.N. an average value of 959”.04 ± 0”.01 is found, for λ = 563.5nm, and an effective bandpass of 168nm. To improve the signal to noise ratio, the images are treated for flat field. This includes distortions brought about by the COHU 4710 camera, the astrolabe optics, and by the system of filters that cut down the incoming solar light. The extensive series observed (over 12000 independent measures) is examined, using a CLEAN periodogram algorithm. The outcome shows periods reconcilable with the solar activity and geometry of observation.

Type
Session I: Global Structure and Evolution of the Solar Interior
Information
Symposium - International Astronomical Union , Volume 203: Recent Insights into the Physics of the Sun and Heliosphere: Highlights from Soho and Other Space Missions , 2001 , pp. 86 - 89
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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