Stuttgart 2012 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 2: International Space Weather Initiative

EP 2.3: Vortrag

Dienstag, 13. März 2012, 11:15–11:30, V55.02

Numerical Modeling of Solar Particle Events and their Impact on Radiation Exposure in Aviation — •Daniel Matthiä, Matthias Meier, Thomas Berger, and Günther Reitz — German Aerospace Center (DLR), Institute of Aerospace Medicine, Linder Höhe, 51147 Cologne, Germany

In addition to the radiation exposure at aviation altitudes caused by galactic cosmic rays, large space weather events can lead to significantly increased dose rates in the atmosphere. Large solar flares in combination with coronal mass ejections may accelerate protons to relativistic energies. After traversing the interplanetary space between Sun and Earth these high-energy particles can cause an increase in primary and secondary particle fluxes in the atmosphere. The largest of these solar particle events are recorded by ground-based neutron monitors in so-called ground level enhancements. The different sensitivities of the neutron monitor stations regarding energy and incoming direction of the solar particles can be used to derive the primary energy spectra of the solar protons and their spatial distributions. The data provided by a number of neutron monitors stations distributed over the whole globe were used to derive the solar proton spectra as well as their temporal evolutions during several ground level enhancements and the resulting radiation exposures at aviation altitudes on selected intercontinental flight routes were estimated by calculating the particle transport through the Earth's magnetosphere and atmosphere.