Kiel 2004 – wissenschaftliches Programm

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EP: Extraterrestrische Physik

EP 1: Heliosph
ären- und Astrophysik

EP 1.1: Fachvortrag

Montag, 8. März 2004, 15:45–16:05, C

Imprints of galactic arm crossings to the terrestrial particle environment — •Hans-Jörg Fahr¹, Horst Fichtner², Klaus Scherer¹, and Olaf Stawicki³ — ¹Institut für Astrophysik und extraterrestrisch Forschung, Univerität Bonn, Germany — ²Institut für Theoretische Physik IV: Weltraum- und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany — ³Unit for Space Physics, School of Physics, Potchefstroom University for CHE, 2520 Potchefstroom, SA

At its galactic itinerary the solar system is touched by highly variable galactic enviroments. Due to its orbital revolution around the galactic center, the solar system periodically crosses the spiral arms of our galactic plane and thereby experiences pronounced environmental changes. Gas densities, magnetic fields, and galactic cosmic ray intensities are higher compared to interarm conditions. Here we develop a theoretical calculation to describe the average cosmic ray spectrum for regions inside and outside galactic arms. This then allows us to predict how passages of the solar system through galactic arms should be reflected in enhanced particle irradiation of the earthś atmosphere and in enhanced atmospheric Be-10 production rates.