Heidelberg 2022 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 5: Near Earth Space
EP 5.5: Hauptvortrag
Dienstag, 22. März 2022, 17:30–18:00, EP-H1
Solar extreme events and their impact on the middle atmosphere — •Thomas Reddmann1, Monali Borthakur1, Miriam Sinnhuber1, Ilya Usoskin2, and Jan-Maik Wissing3 — 1Karlsruhe Institute of Technology, Germany — 2University of Oulu, Finland — 3University of Rostock, Germany
The Sun occasionally produces strong eruptions on its surface and in the corona. Within these strong eruptions, energetic particles are accelerated to high energies which hit the Earth within hours after the event. In addition, ejected plasma clouds can be accelerated towards the Earth causing severe geomagnetic disturbances which also cause particle precipitation. Here we study the impact of a one per millenium solar event on the atmosphere.
We use historical records and analyzed distributions of energy spectra to derive ionization rates for a combined extreme solar proton event and a geomagnetic storm which typically impact different parts of the atmosphere. The ionization rates for the extreme event are then used in simulations in the KASIMA and EMAC model which both include energetic particle induced chemistry. Their simplified production efficiency of NOx and HOx is compared to an ion chemistry model. We select specific dynamical situations for the event which represent a different vertical coupling in the atmosphere. Finally, we estimate the impact of the extreme event under those different dynamical situations on the chemical state in the atmosphere on the seasonal time scale in terms of ozone change and the global NOx budget together with the additional UV dose.