Browsing Natural and Agricultural Sciences by Subject "Diffusion"
Now showing items 1-8 of 8
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An ab initio approach to the heliospheric modulation of galactic cosmic rays
(North-West University, 2006)In the present study we aim to further our understanding of charged particle transport in a magnetized medium. To this end, we perform direct numerical simulations of particle transport in a turbulent magnetic field. From ... -
The development of a fuzzy expert system to aid in the adoption and use of systems development methodologies
(North-West University, 2009)A topic of great interest to the field of information system (IS) development is the concept of systems development methodologies (SDMs) and their successful adoption by, and use in, an organisation. Therefore, there ... -
The effect of the heliospheric current sheet on cosmic-ray modulation
(North-West University (South Africa), Potchefstroom Campus, 2015)The heliospheric current sheet is a dominant feature of the heliosphere. As solar activity increases, the tilt angle of the current sheet increases, and so does the region swept out by this structure, to cover most of ... -
Modelling the evolution of pulsar wind nebulae
(2014)This study focusses on modelling important aspects of the evolution of pulsar wind nebulae using two different approaches. The first uses a hydrodynamic model to simulate the morphological evolution of a spherically-symmetric ... -
The nature of diffusive particle transport in turbulent magnetic fields
(North-West University (South Africa), Potchefstroom Campus, 2016)The transport of charged particles in turbulent plasma is a crucially important area of research in astrophysics, since it directly impacts our ability to interpret observations done with a major group of messenger ... -
On the development and applications of a three–dimensional ab initio cosmic–ray modulation model
(North-West University, 2012)A proper understanding of the effects of turbulence on the diffusion and drift of cosmic-rays in the heliosphere is imperative for a better understanding of cosmic-ray modulation. This study presents an ab initio model ... -
On the heliospheric diffusion tensor and its effect on 26-day recurrent cosmic-ray variations
(North-West University, 2008)A first attempt at an ab initio steady-state three-dimensional modulation model for galactic cosmic ray electrons, utilizing expressions adapted from the work of Teufel and Schlickeiser [2003] and Shalchi et al. [2004a] ... -
The solar-cycle dependence of the heliospheric diffusion tensor
(North-West University, 2015)Long-term cosmic-ray modulation studies using ab initio numerical modulation models require an understanding of the solar-cycle dependence of the heliospheric diffusion tensor. Such an understanding requires information ...