Probability and strength of extreme SPE spectra for G-stars

Kurzfassung

Extreme solar particle events (SPEs) are rare by definition. In our solar system, satellites offer measurements of a couple of major SPEs. Some larger ones can be found in historical data such as ice cores - with limitations concerning the recorded spectral information. The shape of the spectrum, however, is crucial for a determination of the atmospheric impact. An offset of some kilometers in atmospheric altitude may distinguish between photolytic destruction or tropospheric wash out of chemical follow-ups. In this work we will show a method to determine the probability and strength of severe SPEs of G-stars. This approach is based on a statistical analysis of in-situ particle measurements. We provide energy dependent particle fluxes for e.g. a once in 10000 years SPE and the expected atmospheric energy deposition. These results can also be applied to exoplanets orbiting similar stars.