82 citations · 1.3k across the 57 of their papers we have counts for
57 papers
Relativistic regularized kappa distributions
Linh Han Than, Klaus Scherer, Horst Fichtner
The special relativistic generalization of isotropic regularized kappa distributions is derived and compared to that of the original Olbertian (or standard) kappa distributions. It…
Electron Holes in a Regularized Kappa Background
Fernando Haas, Horst Fichtner, Klaus Scherer
The pseudopotential method is used to derive electron hole structures in a suprathermal plasma having a regularized probability distribution function background. The regularize…
Turbulence in the outer heliosphere
Federico Fraternale, Laxman Adhikari, Horst Fichtner +9
The solar wind (SW) and local interstellar medium (LISM) are turbulent media. Their interaction is governed by complex physical processes and creates heliospheric regions with sign…
Implications from 3D modeling of gamma-ray signatures in the Galactic Center Region
J. Becker Tjus, P. -S. Blomenkamp, J. Dörner +4
Context. The Galactic Center (GC) region has been studied in gamma rays in the past decades - the GC excess detected by Fermi is still not fully understood and the first detection…
On the properties of 0.11 keV to 344 MeV ion spectra in the inner heliosheath using regularized -distributions
Klaus Scherer, Kostas Dialynas, Horst Fichtner +2
The shape of the ion energy spectra plays a critical role toward determining the ion energetics, the acceleration mechanisms and the possible sources of different plasma and suprat…
Revisiting the Ulysses electron data with a triple fit of velocity distributions
Klaus Scherer, Edin Husidic, Marian Lazar +1
Given their uniqueness, the Ulysses data can still provide us with valuable new clues about the properties of plasma populations in the solar wind, and, especially, about their var…
Modelling O-star astrospheres with different relative speeds between the ISM and the star: 2D and 3D MHD model comparison
L. R. Baalmann, K. Scherer, J. Kleimann +3
Context. State of the art simulations of astrospheres are modelled using three-dimensional (3D) magnetohydrodynamics (MHD). An astrospheric interaction of a stellar wind (SW) with…
Towards a realistic evaluation of transport coefficients in non-equilibrium space plasmas
Edin Husidic, Klaus Scherer, Marian Lazar +2
Recent studies have outlined the interest for the evaluation of transport coefficients in space plasmas, where the observed velocity distributions of plasma particles are condition…
Implications of turbulence-dependent diffusion on cosmic-ray spectra
J. Dörner, P. Reichherzer, L. Merten +4
The propagation of cosmic rays can be described as a diffusive motion in most galactic environments. High-energy gamma-rays measured by Fermi have allowed inference of a gradient i…
An Exact, Time-dependent Analytical Solution for the Magnetic Field in the Inner Heliosheath
Christian Röken, Jens Kleimann, Horst Fichtner
We derive an exact, time-dependent analytical magnetic field solution for the inner heliosheath, which satisfies both the induction equation of ideal magnetohydrodynamics in the li…
Transport coefficients enhanced by suprathermal particles in nonequilibrium heliospheric plasmas
Edin Husidic, Marian Lazar, Horst Fichtner +2
In heliospheric plasmas the transport of energy and particles is governed by various fluxes (e.g., heat flux) triggered by different forces, electromagnetic fields, and gradients i…
A new low-beta regime for unstable proton firehose modes in bi-Kappa distributed plasmas
S. M. Shaaban, M. Lazar, R. F. Wimmer-Schweingruber +1
In the solar wind plasma an excess of kinetic temperature along the background magnetic field stimulates proton firehose modes to grow if the parallel plasma beta parameter is suff…
Generalized anisotropic -cookbook: 2D fitting of Ulysses electron data
Klaus Scherer, Edin Husidic, Marian Lazar +1
Observations in space plasmas reveal particle velocity distributions out of thermal equilibrium, with anisotropies (e.g., parallel drifts or/and different temperatures, $T_\paralle…
On the Generation of Compressible Mirror-mode Fluctuations in the Inner Heliosheath
Horst Fichtner, Jens Kleimann, Peter H. Yoon +3
Measurements made with the Voyager 1 spacecraft indicate that significant levels of compressive fluctuations exist in the inner heliosheath. Some studies have already been performe…
The -cookbook: a novel generalizing approach to unify -like distributions for plasma particle modeling
Klaus Scherer, Edin Husidic, Marian Lazar +1
In the literature different so-called -distribution functions are discussed to fit and model the velocity (or energy) distributions of solar wind species, pickup ions or magneto…
On the Diversity of M-Star Astrospheres and the Role of Galactic Cosmic Rays Within
Konstantin Herbst, Klaus Scherer, Stefan E. S. Ferreira +7
With upcoming missions such as the James Webb Space Telescope (JWST), the European Extremely Large Telescope (ELT), and the Atmospheric Remote-sensing Infrared Exoplanet Large-surv…
Linear Dispersion Theory of Parallel Electromagnetic Modes for Regularized Kappa-Distributions
Edin Husidic, Marian Lazar, Horst Fichtner +2
The velocity particle distributions measured in-situ in space plasmas deviate from Maxwellian (thermal) equilibrium, showing enhanced suprathermal tails which are well described by…
A new class of discontinuous solar wind solutions
Bidzina M. Shergelashvili, Velentin N. Melnik, Grigol Dididze +6
A new class of one-dimensional solar wind models is developed within the general polytropic, single-fluid hydrodynamic framework. The particular case of quasi-adiabatic radial expa…
MHD-shock structures of astrospheres: Cephei-like astrospheres
K. Scherer, L. R. Baalmann, H. Fichtner +5
The interpretation of recent observations of bow shocks around O-stars and the creation of corresponding models require a detailed understanding of the associated (magneto-)hydrody…
Skymaps of observables of three-dimensional MHD astrosphere models
L. R. Baalmann, K. Scherer, H. Fichtner +3
Three-dimensional models of astrospheres have recently become of interest. However, comparisons between these models and observations are non-trivial because of the two-dimensional…
An empirical model of Energetic Neutral Atom imaging of the heliosphere and its implications for future heliospheric missions at great heliocentric distances
Andre Galli, Peter Wurz, Horst Fichtner +2
Several concepts for heliospheric missions operating at heliocentric distances far beyond Earth orbit are currently investigated by the scientific community. The mission concept of…
Whistler instability stimulated by the suprathermal electrons present in space plasmas
M. Lazar, R. A. Lopez, S. M. Shaaban +2
In the absence of efficient collisions, deviations from thermal equilibrium of plasma particle distributions are controlled by the self-generated instabilities. The whistler instab…
Moments of the anisotropic regularized -distributions
Klaus Scherer, Marian Lazar, Edin Husidic +1
For collisionless (or collision-poor) plasma populations which are well described by the -distribution functions (also known as the Kappa or Lorentzian power-laws) a macroscopic…
On the applicability of -distributions
Klaus Scherer, Horst Fichtner, Hans-Jörg Fahr +1
The standard (non-relativistic) -distribution is widely used to fit data and to describe macroscopic thermodynamical behavior, e.g.\ the pressure (temperature) as the second mom…