For the last 25 years, ground time series of the solar radius have shown (different) apparent variations according to different instruments. The origin of these variations may search in the observer, the instrument, the atmosphere and up to the sun. Ground instruments are automated to reduce the "personnal equation" and place that origin in the...
-
2006 (v1)Journal articleUploaded on: December 3, 2022
-
2004 (v1)Journal article
Astronomy and Astrophysics, v. 427, n. 2, p. 717-723, 2004. http://dx.doi.org/10.1051/0004-6361:20041334
Uploaded on: December 4, 2022 -
July 1, 2012 (v1)Conference paper
PICARD is a space mission launched in June 2010 to study mainly the geometry of the Sun. The PICARD mission has a ground program consisting mostly in four instruments based at the Calern Observatory (Obser-vatoire de la Côte d'Azur). They allow recording simultaneous solar images and various atmospheric data from ground. The ground instruments...
Uploaded on: December 4, 2022 -
2014 (v1)Journal article
For the past thirty years, modern ground-based time-series of the solar radius have shown different apparent variations according to different instruments. The origins of these variations may result from the observer, the instrument, the atmosphere, or the Sun. Solar radius measurements have been made for a very long time and in different ways....
Uploaded on: March 25, 2023 -
July 2012 (v1)Conference paper
For the last thirty years, ground time series of the solar radius have shown different variations according to different instruments. The origin of these variations may be found in the observer, the instrument, the atmosphere and the Sun. These time series show inconsistencies and conflicting results, which likely originate from instrumental...
Uploaded on: December 4, 2022