Browsing by Author "Fichtner, Horst"

Now showing items 1-4 of 4

  • Anomalous transport of cosmic rays in a nonlinear diffusion model

    Litvinenko, Yuri E.; Fichtner, Horst; Walter, Dominik (The American Astronomical Society, 2017)
    We investigate analytically and numerically the transport of cosmic rays following their escape from a shock or another localized acceleration site. Observed cosmic-ray distributions in the vicinity of heliospheric and ...
  • On the generation of compressible mirror-mode fluctuations in the inner heliosheath

    Fichtner, Horst; Kleimann, Jens; Yoon, Peter H.; Scherer, Klaus; Oughton, Sean; Engelbrecht, N. Eugene (IOP Publishing Ltd, 2020)
    Measurements made with the Voyager 1 spacecraft indicate that significant levels of compressive fluctuations exist in the inner heliosheath. Some studies have already been performed with respect to the mirror-mode instability ...
  • A perturbative approach to a nonlinear advection-diffusion equation of particle transport

    Walter, Dominik; Fichtner, Horst; Litvinenko, Yuri E. (AIP Publishing, 2020)
    We explore analytical techniques for modeling the nonlinear cosmic ray transport in various astrophysical environments which is of significant current research interest. While nonlinearity is most often described by coupled ...
  • The IBEX ribbon as a signature of the inhomogeneity of the local interstellar medium

    Fichtner, Horst; Scherer, Klaus; Effenberger, Frederic; Zönnchen, Jochen; Schwadron, Nathan; McComas, David J. (2014)
    Context. A new hypothesis is offered to explain the so-called ribbon feature appearing in the all-sky flux maps of energetic neutral atoms presently observed with the IBEX spacecraft, namely that the ribbon is a consequence ...