Erlangen 2022 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 15: Poster 2
MO 15.12: Poster
Mittwoch, 16. März 2022, 16:30–18:30, P
EUV absorption and recombination dynamics in atmospheric gas species — •Steffen Wolter1, Erik Schmölter2, Jens Berdermann2, and Stefan Lochbrunner1 — 1Institute of Physics, University of Rostock, 18051 Rostock, Germany — 2Department for Space Weather Impact, Institute for Solar-Terrestrial Physics, Kalkhorstweg 53, 17235 Neustrelitz, Germany
Ground- and space-based measurements show that the extreme ultraviolet (EUV) part of the solar spectrum changes continuously and can be very dynamic, especially during solar flares. The ionospheric plasma in the upper atmosphere is created by the absorption of this radiation and affected by the related variations. Therefore, exact knowledge of the ionization and recombination rates of the atmospheric gas species, mainly oxygen, nitrogen and their ions, is needed to model the ionospheric response to the EUV variations.
To this end, a high harmonic generation (HHG) setup driven by a femtosecond laser combined with an EUV spectrometer is applied to investigate the ionization cross-sections. The setup and first results for different gas species as well as the approach to measure recombination rates are presented in this contribution.