Browsing by Subject "diffusion"
Now showing items 1-10 of 19
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An AB initio model for cosmic-ray modulation
(IOP Publishing, 2013)A proper understanding of the effects of turbulence on the diffusion and drift of cosmic rays (CRs) is of vital importance for a better understanding of CR modulation in the heliosphere. This study presents an ab initio ... -
An AB initio model for the modulation of galactic cosmic-ray electrons
(IOP Publishing, 2013)The modulation of galactic cosmic-ray electrons is studied using an ab initio three-dimensional steady state cosmicraymodulation code in which the effects of turbulence on both the diffusion and drift of these cosmic-rays ... -
A comparison of turbulence-reduced drift coefficients of importance for the modulation of galactic cosmic-ray protons in the supersonic solar wind
(Elsevier, 2015)The study of the modulation of cosmic rays in the heliosphere relies heavily on a thorough understanding of the transport of these charged particles in the turbulent solar wind. Drift effects due to gradients and the ... -
Cosmic-ray modulation: an ab initio approach
(Springer Verlag, 2014)A better understanding of cosmic-ray modulation in the heliosphere can only be gained through a proper understanding of the effects of turbulence on the diffusion and drift of cosmic rays. We present an ab initio model ... -
A cosmic-ray positron anisotropy due to two middle-aged, nearby pulsars?
(IOP Publishing, 2008)Geminga and B0656+14 are the closest pulsars with characteristic ages in the range of 100 kyr to 1 Myr. They both have spin-down powers of the order 3 × 1034 ergs s–1 at present. The winds of these pulsars had most probably ... -
The evaluation of a solar–driven aqua–ammonia diffusion absorption heating and cooling cycle
(North-West University, 2013)An ever-increasing demand for energy with virtually no decline in our dependence on fossil fuels puts the world’s non-renewable resources under great pressure. This problem necessitates careful consideration of alternative ... -
A generalized diffusion tensor for fully anisotropic diffusion of energetic particles in the heliospheric magnetic field
(IOP Publishing, 2012)The spatial diffusion of cosmic rays in turbulent magnetic fields can, in the most general case, be fully anisotropic, i.e., one has to distinguish three diffusion axes in a local, field-aligned frame. We reexamine the ... -
An investigation into the suitability of electronic banking technologies for the elderly
(North-West University, 2018)It is no secret that banks are increasingly using electronic channels to render services. Among these services are ATMs, internet banking with personal computers and mobile devices, to name a few. This is a bonus for many ... -
Is the highest cosmic-ray flux yet to come?
(Springer, 2014)The recent 2009 solar-minimum period was characterized by a record-setting high Galactic cosmic-ray flux observed at Earth. This, along with the unexpected low heliospheric magnetic-field magnitude, caused this period ... -
Modeling drift along the heliospheric wavy neutral sheet
(IOP Publishing, 2012)Drift along the wavy heliospheric neutral sheet is believed to play an important role in cosmic-ray modulation and can explain the peaked versus flat intensity profiles during consecutive solar magnetic epochs. Modulation ...