SMuK 2021 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 4: Near Earth Space II
EP 4.3: Talk
Tuesday, August 31, 2021, 17:15–17:30, H8
Comparison of the chemical impact of extreme solar events with the Halloween solar proton event (SPE) in late October 2003 in the middle atmosphere using a 1D ion-chemistry model — •Monali Borthakur1, Thomas Reddmann1, Miriam Sinnhuber1, Ilya Usoskin2, Jan-Maik Wissing3, and Olesya Yakovchuk3 — 1Karlsruhe Institute of Technology, Karlsruhe, Germany — 2University of Oulu, Oulu, Finland — 3University of Rostock, Rostock, Germany
Strong eruptions in the Sun can accelerate protons to high energies, causing solar proton events (SPEs) and inducing geomagnetic disturbances. Such energetic particles can precipitate upon the Earth's atmosphere, mostly polar regions. We considered an extreme solar event combining an extreme SPE and a geomagnetic storm as derived from historical records of cosmogenic nuclides. The ionization rates (IRs) were calculated for strong directly observed events and scaled to represent extreme events. The chemical composition changes of different atmospheric components (Ozone, NOx, HOx, Cl) due to the extreme solar event and the Halloween SPE are compared in the middle atmosphere doing simulations in a 1D box model of the atmospheric neutral and ion composition. The motivation behind using this model is that it assumes canonical NOx/HOx per ion pair used in chemistry climate models (CCMs). Temperature, pressure and the initial state of the neutral atmosphere are input into the model that were obtained from the EMAC CCM using IRs from AIMOS. The IRs for the Halloween SPE were obtained from AISSTORM data.