Datacubes of H$α$, CaII K, CaII H and H$ε$ line profiles of the full solar disk recorded daily at Meudon observatory since 2017 and some typical profiles of solar features

Abstract

Systematic observations of the Sun are performed at Meudon observatory since 1908 under the form of monochromatic images. However, a major technical improvement occurred in 2017; since this date, spectroscopic datacubes are obtained daily with the spectroheliograph and a fast CCD camera. Line profiles of H$α$ (6562.8 A), CaII K (3933.7 A), CaII H (3968.5 A) and H$ε$ (3970.1 A in the wing of CaII H) are recorded over the full solar disk under the form of 3D FITS files (x, y, $λ$). The optical spectral resolution is 0.15 A for Calcium and H$ε$ (0.093 A/pixel), and 0.25 A for H$α$ (0.155 A/pixel); the spatial sampling is about 1 arc sec (the usual seeing is 2 arcsec). Datacubes are freely available since July 2017 in raw TIF (level 0) or processed FITS (level 1) format. Access to observations and typical line profiles associated to solar features are presented.