Parts | Days | Selection | Search | Downloads | Help
EP: Extraterrestrische Physik
EP 3: Sonne und Heliosph
äre
EP 3.7: Talk
Monday, March 18, 2002, 18:05–18:20, HS 15
The influence of the solar-cycle induced solar wind variations on the global structure of the heliosphere. — •Klaus Scherer1 and Hans-Jörg Fahr2 — 1dat-hex, Obere Str. 11, 37191 Gillersheim — 2Universität Bonn, Auf dem Hügel 71, 53121 Bonn
The longperiodic solar cycle variations propagate outwards through the interplanetary space until they finally reach the heliospheric termination shock. The associated variation of the solar wind ram pressure not only influences there the stand-off distance of the termination shock, but also changes the production and the heliospheric distribution of pick-up ions (PUIs). As a consequence, also the production of anomalous cosmic rays (ACRs) related to PUI-fluxes arriving at the shock varies, the propagation of ACRs is influenced and the modulation of the galactic cosmic rays strongly differs. To quantitatively study this scenario we use a a multi-fluid hydrodynamic simulation code to model the interaction of the solar-cycle modulated heliosphere with the interstellar medium. In this code all dynamically relevant species are described by separate plasma fluids within a consistent multifluid context. In a first step we describe the solar-cycle induced heliospheric variations by a series of static models. The obtained set of different heliosphere configurations is then taken as envelopping a fully time-dependent model, in which the solar-cycle varying SW parameters are modeled on the basis of actually time-dependent variations. Here we present the results of the static model runs with emphasis on PUI, ACR and GCR distributions. We also will discuss first results of the time-dependent model.