Bonn 2010 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 3: Poster

EP 3.5: Poster

Montag, 15. März 2010, 17:45–19:00, AKM Foyer

On the importance of the Local Interstellar Spectrum for the Solar Modulation Parameter — •Klaudia Herbst1, Andreas Kopp1, Bernd Heber1, Friedhelm Steinhilber2, Horst Fichtner3, Klaus Scherer3, and Daniel Matthiä4,11IEAP, Christian-Albrechts-Universität zu Kiel, Kiel, Germany — 2Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland — 3Theoretische Physik IV, Ruhr-Universität Bochum, Bochum, Germany — 4Institut für Luft- und Raumfahrzmedizin, Deutsches Zentrum für Luft- und Raumfahrt, Köln, Germany

We compare several local interstellar proton spectra often used in literature. We show that the modulation parameter φ, which parametrizes the modulation of the local interstellar spectrum (LIS) in the heliosphere, strongly depends on the LIS itself. Taking the LIS dependency of the modulation parameter into account, we derive linear equations to convert φ between the different LIS. The conversions used are afterwards applied to a long-term reconstruction of φ derived from a record of the cosmogenic radionuclide, 10Be. For some LIS models occasionally negative φ values are obtained, a fact which is impossible from the physical point of view. Despite non-heliospheric effects such as uncertainties in the geomagnetic field and climate influences on the 10Be production, one possible reason may also be the choice of the LIS. We show that the reconstruction of φ provides the potential to derive the lower intensity limit of the LIS, keeping in mind that first the non-heliospheric effects have to be removed from the data.

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