SH030-0011
Long-term Evolution of the Solar Corona Using PROBA2 Data

Friday, 11 December 2020
Poster
Marilena Mierla1, Jan Janssens1, Elke D'Huys2, Laurence Wauters2, Matthew John West2, Daniel B Seaton3, David Berghmans2 and Olena Podladchikova4, (1)SIDC, Royal Observatory of Belgium, Brussels, Belgium, (2)Royal Observatory of Belgium, Brussels, Belgium, (3)Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder, United States, (4)PMOD WRC Physical Meteorological Observatory Davos and World Radiation Center, Davos Dorf, Switzerland
Abstract:
We use the SWAP imager onboard PROBA2 mission to study the evolution of large-scale EUV structures in the solar corona observed throughout Solar Cycle 24 (from 2010 to 2019). We look at the evolution of the coronal features on-disk and at different heights above the solar surface and compare them at different phases of the solar cycle, as well as with sunspot number evolution and with the PROBA2/LYRA signal. We find that the three time series (SWAP on-disk average brightness, sunspot number and LYRA irradiance) are very well correlated, with correlation coefficients around 0.9. Large-scale off-limb structures were visible from around March 2010 to around March 2016, meaning that they were absent at the minimum phase of solar activity.
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