R. Ikhlef
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View article: On the importance of astronomical refraction for modern solar astrometric measurements
On the importance of astronomical refraction for modern solar astrometric measurements Open
In this work we study in details the influence of pure astronomical\nrefraction on solar metrologic measurements made from ground-based full disk\nimagery and provide the tools for correcting the measurements and estimating\nthe associated…
View article: Solar radius determined from PICARD/SODISM observations and extremely weak wavelength dependence in the visible and the near-infrared
Solar radius determined from PICARD/SODISM observations and extremely weak wavelength dependence in the visible and the near-infrared Open
Context . In 2015, the International Astronomical Union (IAU) passed Resolution B3, which defined a set of nominal conversion constants for stellar and planetary astronomy. Resolution B3 defined a new value of the nominal solar radius ( R …
View article: Effect of optical turbulence on solar astrometry by imaging
Effect of optical turbulence on solar astrometry by imaging Open
L'objectif est de comprendre d'effet de la turbulence optique sur la mesure au sol du rayon solaire. La mesure du rayon solaire avec précision est importante pour les modèles de structure et d'évolution solaire et stellaire. En plus l'acti…
View article: Effet de la turbulence optique sur l'astrométrie solaire par imagerie
Effet de la turbulence optique sur l'astrométrie solaire par imagerie Open
The objective is to understand the effect of optical turbulence on ground-based solar radius measurements. The measurement of the solar radius with accuracy is important for models of solar and stellar structure and evolution. In addition …
View article: MISOLFA: a generalized monitor for daytime spatio-temporal turbulence characterization
MISOLFA: a generalized monitor for daytime spatio-temporal turbulence characterization Open
Ground-based solar observations are strongly affected by optical turbulence. The concept of a new instrument which allows one to measure both spatial and temporal parameters of atmospheric turbulence has been proposed in the late 1990s. Th…
View article: ON THE CONSTANCY OF THE DIAMETER OF THE SUN DURING THE RISING PHASE OF SOLAR CYCLE 24
ON THE CONSTANCY OF THE DIAMETER OF THE SUN DURING THE RISING PHASE OF SOLAR CYCLE 24 Open
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