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Fig. 7.4 (a) Thermoheliometer built by Secchi in 1863 to estimate the solar radiative emission; (b)
internal structure of the instrument; (c) for comparison, TSIS (Kopp et al. 2016; Kopp 2020) instrument was launched in 2017 to monitor solar irradiance from space
7 The Legacy of Angelo Secchi at the Forefront of Solar Physics Research
Fig. 7.4 (a) Thermoheliometer built by Secchi in 1863 to estimate the solar radiative emission; (b)
internal structure of the instrument; (c) for comparison, TSIS (Kopp et al. 2016; Kopp 2020) instrument was launched in 2017 to monitor solar irradiance from space
7 The Legacy of Angelo Secchi at the Forefront of Solar Physics Research