The solar irradiance data that AutoChem used was kindly provided by Judith Lean on the Naval Research Laboratory (NRL), in Washinghton DC. Daily files are available from 1975 to 2004. Future updates will hopefully be available from Judith. To install these files for use within AutoChemV8 download the files below to one directory level below AutoChemV8, i.e. by using cd .. while in the AutoChemV8 root directory.