54 citations · 158 across the 10 of their papers we have counts for
10 papers
Jovian electrons in the inner heliosphere: Opportunities for Multi-spacecraft Observations and Modeling
R. D. Strauss, N. Dresing, N. E. Engelbrecht +11
In this paper we explore the idea of using multi-spacecraft observations of Jovian electrons to measure the 3D distribution of these particles in the inner heliosphere. We present…
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…
Viability tests of \textit{f(R)}-gravity models with Supernovae Type 1A data
Renier Hough, Amare Abebe, Stefan Ferreira
In this work, we will be testing four different general \textit{f(R)}-gravity models, two of which are the more realistic models (namely the Starobinsky and the Hu-Sawicki models),…
Cosmic rays in astrospheres
Klaus Scherer, Ausgusts van der Schyff, Dominik Bomans +7
Cosmic rays passing through large astrospheres can be efficiently cooled inside these "cavities" in the interstellar medium. Moreover, the energy spectra of these energetic particl…
Time-dependent cosmic ray modulation in the outer heliosphere: Signatures of a heliospheric asymmetry and model predictions along Voyager 1 and 2 trajectories
Rex Manuel, Stefan Ferreira, Marius Potgieter
A two-dimensional, time-dependent numerical model is used to calculate the modulation of cosmic rays in the heliosphere. Computations are compared to spacecraft observations in the…
Time-Dependent Modulation of Cosmic Rays in the Heliosphere
Rex Manuel, Stefan Ferreira, Marius Potgieter
The time-dependent modulation of galactic cosmic rays in the heliosphere is studied by computing intensities using a time-dependent modulation model. By introducing recent theoreti…
Time-dependent modelling of pulsar wind nebulae
M. J. Vorster, O. Tibolla, S. E. S. Ferreira +1
A spatially-independent model that can be used to calculate the temporal evolution of the electron/ positron spectrum in a spherically expanding pulsar wind nebula is presented. Th…
Are most of the VHE gamma-ray unidentified sources relic PWNe?
Omar Tibolla, Michael Vorster, Sarah Kaufmann +2
The evolution of Pulsar Wind Nebulae (PWNe) plays a crucial role in interpreting the very high energy (VHE; > 10^11 eV) gamma-ray unidentified sources; and moreover it represents t…
Unidentified Galactic High-Energy Sources as Ancient Pulsar Wind Nebulae in the light of new high energy observations and the new code
O. Tibolla, M. Vorster, O. de Jager +5
In a Pulsar Wind Nebula (PWN), the lifetime of inverse Compton (IC) emitting electrons exceeds the lifetime of its progenitor pulsar (as well as its shell-type remnant), but it als…
Unidentified Gamma-Ray Sources as Ancient Pulsar Wind Nebulae
O. C. de Jager, S. E. S. Ferreira, A. Djannati-Ataï +6
In this paper we explore the evolution of a PWN while the pulsar is spinning down. An MHD approach is used to simulate the evolution of a composite remnant. Particular attention is…