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EP: Fachverband Extraterrestrische Physik
EP 11: Near-Earth Space I
EP 11.4: Vortrag
Donnerstag, 23. März 2023, 15:00–15:15, ZEU/0160
A new approach to constrain space weather effects on the Earth’s atmosphere — •Florian Haenel1, Miriam Sinnhuber1, Alina Grishina2, and Yuri Shprits2 — 1Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany — 2Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany
We investigate the impact of space weather on the Earth’s middle atmosphere and its climate system using state of the art numerical models of the magnetosphere and atmosphere. In particular, we study the impact of electrons with medium-range energy, mostly from the Earth’s radiation belts, lost into the atmosphere during geomagnetic storms. Previous studies, using ionization rates, based on electron fluxes measured by satellites show an underestimation of produced NOx (NO+NO2) by comparison with satellite observations and exhibit a large uncertainty. NOx produced by electron precipitation in the mesosphere and lower thermosphere is the starting point of the so-called "indirect effect" altering stratospheric temperatures and winds, which even might impact surface climate. As consequence, this effect is consistently being underestimated in chemistry-climate models. We use a new approach to shed light on these uncertainties. We use precipitating electron fluxes simulated by the magnetospheric model VERB-4D, which will serve as an input for chemistry-climate simulations by the atmospheric model EMAC. Here, we will apply this combination of models in a case study of a geomagnetic active period in March/April 2010 and compare with previous data sets.