Browsing Natural and Agricultural Sciences by Subject "Solar modulation"

Now showing items 1-7 of 7

    • Acceleration of cosmic rays in the outer heliosphere 

      Prinsloo, Phillip Lourens (North-West University (South Africa), Potchefstroom Campus, 2016)
      Shortly before the Voyager spacecraft crossed the heliospheric termination shock, they encountered narrow, peak-like enhancements in the intensities of low-energy electrons. These enhancements were associated at the time ...

    • A comparative study of cosmic ray modulation models 

      Raath, Jan Louis (North-West University, 2015)
      Until recently, numerical modulation models for the solar modulation of cosmic rays have been based primarily on finite difference approaches; however, models based on the solution of an appropriate set of stochastic ...

    • Cosmic ray propagation in the galaxy and the heliosphere 

      Bisschoff, Driaan (North-West University, 2018)
      The local interstellar spectra (LIS’s) for cosmic rays (CRs) are still not fully determined over all energy ranges. Numerical modelling, such as with the GALPROP code, can be used to calculate LIS’s for a wide set of CR ...

    • Modeling of electrons in the heliosphere 

      Nndanganeni, Rendani Rejoyce (North-West University (South Africa), Potchefstroom Campus, 2016)
      The propagation and modulation of electrons in the heliosphere play an important part in improving our understanding and assessment of the processes of solar modulation. A locally developed, full three-dimensional, ...

    • Modeling of galactic cosmic rays in the heliosphere 

      Ngobeni, Mabedle Donald (2015)
      The modulation of galactic cosmic ray (GCR) Carbon in a north-south asymmetrical heliosphere is studied, using a two-dimensional numerical model that contains a solar wind termination shock (TS), a heliosheath, as well as ...

    • A stochastic approach to the modelling of cosmic rays in the heliosphere 

      Raath, Jan Louis (North-West University (South Africa), 2020)
      A spatially three-dimensional numerical modulation model based on solving a set of stochastic differential equations, corresponding to the Parker transport equation, is employed to study the galactic proton spectra measured ...

    • Time–dependent modulation of cosmic rays in the outer heliosphere 

      Manuel, Rex (North-West University, 2013)
      The time-dependent modulation of galactic cosmic rays in the heliosphere is studied by computing intensities using a two-dimensional, time-dependent modulation model. The compound approach of Ferreira and Potgieter (2004), ...