Bremen 2017 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 3: Astrophysik

EP 3.8: Talk

Monday, March 13, 2017, 18:15–18:30, GW2 B2880

Response Functions to High Energetic Particle Radiation of the Standard Radiation Monitor (SREM) On-board the Rosetta Mission — •Sascha Lüdeke¹, Vanessa Wyrwoll¹, Hugh Evans², and Björn Poppe¹ — ¹University of Oldenburg, Germany — ²ESA/ESTEC, Noordwijk, The Netherlands

To study the flux and composition of galactic cosmic rays and to monitor the radiation burden many space missions are equipped with radiation monitors. One of these monitors is the Standard Radiation Environment Monitor (SREM) on-board the Rosetta Mission. Measurements of these monitors can only be evaluated in detail when the response functions of the monitors are known. They can be determined by measurements, which is impractical considering the energy range of galactic cosmic rays, or simulation, as done in this work. At first the monitor geometry was implemented for use in a Monte-Carlo simulation environment based on Geant4(10.01)/GRAS(03.04). Then a setup to simulate an isotropic radiation environment was implemented and response functions to protons calculated. The radiation environment is comprised of 648 individual planar sources, approximating an omnidirectional spherical source radiating inwards. The response of the SREM channels to each planar source is determined and combined into an omnidirectional response function by summing with a weight corresponding to the solid angle. After benchmarking, the simulations were extended for galactic cosmic ray particles from Helium to Oxygen with energies up to 100GeV/u. Future work will characterize the influence of the Rosetta orbiter on the response of the SREM to GCR radiation.