Browsing Natural and Agricultural Sciences by Subject "Solar activity"

Now showing items 1-9 of 9

    • 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 radiation measurements in the southern hemisphere, with the focus on aviation altitudes 

      Mosotho, Moshe Godfrey (North-West University (South Africa), 2021)
      The radiation environment around the Earth is intense and complex. During the dawn of the aviation age in 1903, when the Wright brothers Orville and Wilbur invented, built, and flew the world’s first successful aircraft, ...

    • 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 ...

    • The modulation of galactic cosmic rays over a solar cycle 

      Mohlolo, Selwana Timothy (North-West University (South Africa), 2016)
      This work studied the modulation of galactic cosmic rays in the heliosphere by using a well-established, time dependent numerical modulation model to calculate cosmic ray transport inside the heliosphere over a solar ...

    • 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 ...

    • A study of cosmic ray anisotropies in the heliosphere 

      Nkosi, Godfrey Sibusiso (North-West University, 2006)
      The three-dimensional (3D) steady-state electron modulation model of Ferreira (2002), based on Parker (1965) transport equation, is used to study the modulation of the 7 MeV galactic and Jovian electron anisotropies in ...

    • A study of the time-dependent modulation of cosmic rays in the inner heliosphere 

      Magidimisha, Edwin (North-West University, 2010)
      A two-dimensional (2-D) time-dependent cosmic ray modulation model is used to calculate the modulation of cosmic-ray protons and electrons for 11-and 22-year modulation cycles using a compound approach to describe solar ...

    • Sunspot detection and tracking using image processing techniques 

      Du Toit, Ruben (North-West University (South Africa), 2022)
      Over the past five decades, space weather forecasting has gained significant interest since mankind started exploring the solar system using highly developed technology. Power and communication systems are critical for ...

    • 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), ...