EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Simulating effects of the 774 AD solar proton event on atmospheric electricity

Stergios Misios1,2,3, Mads F. Knudsen1,2, and Christoffer Karoff1,2
Stergios Misios et al.
  • 1University of Aarhus, Department of Geoscience, Aarhus C, Denmark
  • 2iCLIMATE Interdisciplinary Centre for Climate Change, Aarhus University, Aarhus C, Denmark
  • 3National Observatory of Athens, Athens, Greece

High energy cosmic rays of galactic and solar origin, natural radioactivity, lighting in thunderstorms and electrified shower clouds, produce ion clusters and charge the whole atmosphere causing a ubiquitous potential difference between the ionosphere and the surface. This Global Electric Circuit (GEC) allows the flow of charges to the surface in the fair-weather regions of the globe. Here, we simulate the effect of highly energetic particle radiation, in particular the 774 AD solar proton event, on the GEC with the aid of the global circulation model EMAC/MESSy. The simulations assume pre-industrial atmospheric conditions and the coupling of aerosol and atmospheric electricity schemes allows for ion-ion and ion-aerosol capture reactions. We discuss effects in fair weather current and atmospheric conductivity at different latitudinal bands.

How to cite: Misios, S., F. Knudsen, M., and Karoff, C.: Simulating effects of the 774 AD solar proton event on atmospheric electricity, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-13496,, 2021.


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