Greifswald 2024 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 1: Near-Earth Space and Space Weather
EP 1.6: Vortrag
Montag, 26. Februar 2024, 16:50–17:10, ELP 1: HS 1.22
Atmospheric impact of extreme solar eruptions — •Miriam Sinnhuber1, Thomas Reddmann1, Jan Maik Wissing2, and Ilya Usoskin3 — 1Karlsruher Institut für Technologie — 2DLR Neustrelitz — 3University of Oulu, Finland
Large solar eruption - solar flares and coronal mass ejections - can have a significant impact on the chemical composition and dynamics of the polar middle atmosphere. For solar events of the space age since 1957, this is well quantified and understood. However, evidence for much larger events has been derived from paleonuclide records within the last 10000 years. Here, we show results from model experiments comparing the well-known "Halloween" solar storm of October 2003 with an extreme event of AD774/775. Both events had a significant impact on atmospheric composition which lasted for several months. Due to its harder spectrum and larger fluxes, this impact affected lower atmospheric layers during and after the AD774 event. Due to radiative-dynamical feedbacks, both events affected atmospheric temperatures and dynamics as well with larger changes during the event and during polar summer for the stronger AD774 event. However, during polar winter, the preconditioning of the atmosphere seems to play a role as well.
Keywords: solar eruptions; atmospheric composition; middle atmosphere