Bremen 2017 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 7: Sonne und Heliosphäre II
EP 7.7: Vortrag
Mittwoch, 15. März 2017, 10:15–10:30, GW2 B2880
How hot is the heliosheath? — •Klaus Scherer1, Hans-Jörg Fahr2, Horst Fichtner1, Adama Sylla1, and John Richardson3 — 1Theoretische Physik IV, Ruhr Universität Bochum — 2Argelander Institut, Universität Bonn — 3MIT
The temperatures along the Voyager 2 trajectory are determined by assuming an underlying Maxwellian distribution function. It was recently discussed that the underlying distribution function is most probably a kappa distribution. The temperatures determined with a kappa distribution can largely differ to those given by a Maxwellian. We discuss here that the "temperature" is not unique, but depends on the assumed distribution function. Moreover, for the kappa-distribution we give a simple straightforward formula which connects the Maxwellian and kappa temperatures, only depending on the kappa index. Thus knowing a variable kappa index along the Voyager 2 trajectory we can easily estimate the respective temperatures. We demonstrate that using a model in which the kappa indices are calculated.