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Solar astrometry with Rio Astrolabe and Heliometer
Costantino Sigismondi, Sergio Calderari Boscardin, Alexandre Humberto Andrei +3
Monitoring the micro-variations of the solar diameter helps to better understand local and secular trends of solar activity and Earth climate. The instant measurements with the Ref…
The Heliometer of Rio de Janeiro in Operation - 2010 to 2013
Alexandre Humberto Andrei, Costantino Sigismondi, Eugenio Reis-Neto +2
Out of the three quantities that characterize the state of an isolated gaseous body: pressure, temperature and volume the radius is the only one directly measurable for the Sun, wh…
A cycle of measurements of the solar semidiameter with the astrolabe of Rio de Janeiro (1998-2009)
Sérgio Calderari Boscardin
The solar astrolabe at Observatorio Nacional has been doing a series of solar semidiameter measurements, extending from 1998 up to 2009, to a total of 21640 observations of the Sun…
Diameter and solar figure observations in the solar activity context with the astrolabe of Rio de Janeiro in 1998-2003
Sérgio Calderari Boscardin
From 1998 to 2003 the CCD Solar Astrolabe of the Observatorio Nacional in Rio de Janeiro made more than 20000 observations of the Solar Semidiameter. In the present work similar co…
Analysis of a series of measurements of solar semidiameter variations during 2001 at the astrolabe of Rio de Janeiro
Sérgio Calderari Boscardin
From 1997 the Observatorio Nacional has been observing the Sun with an astrolabe in order to study variations on the solar semi-diameter. Till now more than 20.000 observations wer…