The upper atmosphere is a strongly driven system in which the global state is rapidly altered by the solar drivers. Oneof themaindrivers of theupper atmosphere is the solar irradiance in the extremeultraviolet andx-raybands.The solar irradiance in these bands is proxied by ground-basedmeasurements ofF10.7, which is the solar irradiance at the wavelength of 10.7 cm. The problem of estimating F10...
