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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 ...
Modelling of galactic and jovian electrons in the heliosphere
(North-West University, 2004)
A three-dimensional (3D) steady-state electron modulation model based on Parker (1965) transport equation is applied to study the modelling of – 7 MeV galactic and Jovian electrons in the inner
heliosphere. The latter ...
Aspects of the modulation of cosmic rays in the outer heliosphere
(North-West University, 2006)
A time-dependent two-dimensional (2D) modulation model including drifts, the solar wind tennination shock (TS) with diffusive shock acceleration and a heliosheath based on the Parker (1965) transport equation is used to ...
The effect of a Fisk-Parker hybrid magnetic field on cosmic rays in the heliosphere
(North-West University, 2005)
The existence of a Fisk-type heliospheric magnetic field (HMF) is one of the most debated questions in cosmic-ray modulation. Recently, Burger and Hitge [2004] developed a divergence-free Fisk-Parker hybrid magnetic field ...
A study of cosmic ray anisotropies in the heliosphere
(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 ...
Effects of termination shock acceleration on cosmic rays in the heliosphere
(North-West University, 2004)
The interest in the role of the solar wind termination shock (TS) and heliosheath in cosmic ray (CR) modulation studies has increased sigm6cantly as the Voyager 1 and 2 spacecraft approach the estimated position of the TS. ...
A study of the time-dependent modulation of galactic cosmic rays in the heliosphere
(North-West University, 2005)
Time-dependent cosmic ray modulation in the heliosphere is studied by using a two-dimensional
time dependent modulation model. To compute realistic cosmic ray modulation a compound
approach is used, which combines the ...
A calibration neutron monitor for long-term cosmic ray modulation studies
(North-West University, 2006)
The propagation of high-energy cosmic rays is influenced by the time-varying heliospheric
magnetic field embedded in the solar wind, and by the geomagnetic field. To penetrate
through this geomagnetic field, they must ...
Millisecond pulsars and pulsar wind nebulae as sources of gamma rays and cosmic rays
(North-West University, 2008)
Our main aim was to implement a fully 3D General Relativistic (GR) frame-dragging polar cap (PC) millisecond pulsar (MSP) model as a numerical code, and constrain it using multiwavelength and cosmic-ray data. We also ...
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] ...