Heidelberg 2022 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 12: Sun and Heliosphere
EP 12.3: Vortrag
Freitag, 25. März 2022, 11:45–12:00, EP-H1
On Compressible Turbulence in the Inner Heliosheath — •Horst Fichtner1, Jens Kleimann1, Peter Yoon2, Klaus Scherer1, Sean Oughton3, and Eugene Engelbrecht4 — 1Institut für Theoretische Physik IV, Ruhr-Universität Bochum, 44780 Bochum, Germany — 2Institute for Physical Science and Technology, University of Maryland, College Park, USA — 3Department of Mathematics and Statistics, University of Waikato, Hamilton 3240, New Zealand — 4Centre for Space Research, North-West University, Potchefstroom, 2522, South Africa
Measurements made with the Voyager 1 spacecraft indicate that significant levels of compressive fluctuations exist in the so-called inner heliosheath, i.e. the region between the solar wind termination shock and the heliopause. Here we extend previous studies of the mirror-mode instability to the whole inner heliosheath. Employing quasilinear theory combined with results from a global magnetohydrodynamic model of the heliosphere allows for a computation of the time evolution of the temperature anisotropy and the energy density of the magnetic fluctuations related to the mirror mode. We demonstrate the likely presence of the latter in the inner heliosheath. Furthermore, we compute the associated, locally generated density fluctuations. The results can serve as inputs for future models of the transport of compressible fluctuations in this outermost region of the heliosphere.