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EP: Extraterrestrische Physik

EP 6: Kosmische Strahlung und Heliosph
äre

EP 6.5: Vortrag

Samstag, 5. März 2005, 15:30–15:45, TU BH349

Time-dependent energetic neutral atom fluxes from the heliosheath — •Klaus Scherer and Hans-Jörg Fahr — Institut für Astropphysik und extraterrestrische Forsachung der Universität Bonn, Auf dem Hügel 71, 53121 Bonn

In the heliospheric interface energetic neutral atoms (ENA’s) are produced, which can be used to remotely investigate this highly interesting, but poorly known region, improving our knowledge of the interaction between the interstellar medium and the solar wind in the Outer Heliosphere. Not only, ENAs produced in the heliosheath by the charge exchange processes between shocked solar wind protons and interstellar hydrogen are observed with a spacecraft at Earth, for example the upcoming IBEX mission. But there is a contribution from the decharging of pickup ions and from the supersonic solar wind protons inside the termination shock. here we will discuss on the basis of of the five-fluid Bonn model the time-dependent ENA fluxes that are connected with these three sources and compare them. We will show that the ENA fluxes from the heliosheath dominate at low energies in nearly all directions over the background contribution, while for higher energies the changes to disentangle the background contributions are in the up- and downwind direction at specific periods of the solar activity cycle.