Demonstration of the importance of radiation from the corona and transition region for the photoionisation in the He i ground state continuum. Panels a) and b) compare the column integrated lower-level population of the He i 1083 nm line with a) and without b) the inclusion of coronal and TR emission. Panels c) (with emission) and d) (without emission)compare the resulting equivalent widhts of the He i 1083 nm line.