5133 20210118200519.0 SEMIN-2021-0004 Mierla, Marilena Long-term Evolution of the Solar Corona Using PROBA2 Data 2020 2020-09-25 NO Janssens, Jan D’Huys, Elke Wauters, Laurence West, Matthew J. Seaton, Daniel B. Berghmans, David Podladchikova, Elena ROB marilena.mierla@observatoire.be SEMIN