Detection of clear sky instants from high frequencies pyranometric measurements of global horizontal irradianceOmaima El Alani, Hicham Ghennioui, Abdellatif Ghennioui and Fatima-ezzahra DahrE3S Web Conf., 297 (2021) 01028DOI: https://doi.org/10.1051/e3sconf/202129701028