Würzburg 2018 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 1: Near Earth Space

EP 1.3: Vortrag

Montag, 19. März 2018, 17:15–17:30, BSZ - Pabel HS

The response of the middle and lower atmosphere to geomagnetic forcing in a coupled chemistry-climate model — •Miriam Sinnhuber, Sabine Barthlott, and Stefan Versick — Karlsruher Institut für Technologie, Karlsruhe, Germany

Precipitating electrons from the magnetosphere or the radiation belts accelerated in high-speed solar wind streams * called geomagnetic forcing * can affect atmospheric composition, temperatures and wind fields from the thermosphere down to at least the lower stratosphere. In a first instance, chemical composition is affected by impact ionization, which leads to the formation of nitric oxides in the upper mesosphere and thermosphere. Nitric oxide can then be transported down into the stratosphere during polar winter, and destroy ozone there in catalytic cycles. As ozone is one of the key species of radiative heating and cooling of the middle atmosphere, this has a direct impact on temperatures and the thermal wind balance.

We use a chemistry-climate model reaching from the surface up to the thermosphere (~220 km) to investigate the impact of high geomagnetic activity on composition, temperatures and wind fields in the middle and lower atmosphere.