Berlin 2014 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 5: Postersitzung

EP 5.16: Poster

Dienstag, 18. März 2014, 16:30–18:30, DO24 Foyer

Usage of the force field approach and its limitation - a statistical survey — •Jan Gieseler, Bernd Heber, and Konstantin Herbst — IEAP, CAU Kiel, Deutschland

Galactic cosmic rays (GCRs) are modulated by various effects as they propagate through the heliosphere before they can be detected at Earth. The Parker equation describes this transport. It calculates the phase space distribution of GCRs depending on the main modulation processes: convection, drifts, diffusion and adiabatic energy changes. The force field approximation is a simplification of this equation, reducing it to a one-parameter dependency, the force field potential. This approach is commonly used in many fields. Here, we investigate carefully its constraints by comparing spacecraft GCR measurements at different energies for the last four solar cycles with corresponding force field approximations.