Predictions of proton and ⁴He nucleus fluxes during the summer 2020 for the Solar Orbiter mission. The top and bottom continuous (protons) and dashed (⁴He nuclei) curves are obtained with the G&A model above 70 MeV(/n) for a solar modulation parameter of 300 and 340 MV c⁻¹, respectively. The dotted curve represents the lower limit to the predictions of the proton spectrum for the same period, representing the Pamela experiment data gathered in 2008 during a period of solar activity similar to that of Solar Orbiter but during a negative GSMF epoch. Data are reported in Stone (1964, solid dots), Logachev et al. (2003, open triangles), and Marquardt & Heber (2019, solid triangles). The solid stars and the open squares indicate the EPD/HET measurements gathered in the summer 2020 on board Solar Orbiter for protons and helium nuclei, respectively.