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Heliospace physics in South Africa: IHY 2007
(Elsevier, 2008)
An overview is given of research activities in South Africa related to the International Heliophysical Year in 2007. The emphasis is on Space Physics (Geospace and Heliospace). A short historical perspective is given, ...
Modelling of galactic carbon in an asymmetrical heliosphere: effects of asymmetrical modulation conditions
(Elsevier, 2012)
Observations of galactic cosmic rays (GCRs) from the two Voyager spacecraft inside the heliosheath indicate significant differences between them, suggesting that in addition to a possible global asymmetry in the north–south ...
Modelling heliospheric current sheet drift in stochastic cosmic ray transport models
(Springer, 2012)
Drifts are one of the major cosmic ray modulation mechanisms in the heliosphere. Three types of drifts occur in the background heliospheric magnetic field, namely curvature, gradient and current sheet drifts. The last ...
Cosmic ray modulation in the outer heliosphere: predictions for cosmic ray intensities up to the heliopause along Voyager 1 and 2 trajectories
(Elsevier, 2011)
Time dependent cosmic ray modulation in the outer heliosphere is calculated and results are compared to Voyager 1 and 2 observations using a two-dimensional time-dependent cosmic ray transport model. We predict possible ...
Modeling ground and space based cosmic ray observations
(Elsevier, 2012)
After entering our local astrosphere (called the heliosphere), galactic cosmic rays, as charged particles, are affected by the Sun’s turbulent magnetic field. This causes their intensities to decrease towards the inner ...
Time dependence of the flux of helium nuclei in cosmic rays measured by the PAMELA experiment between 2006 July and 2009 December
(IOP, 2020)
Precise time-dependent measurements of the Z = 2 component in the cosmic radiation provide crucial information about the propagation of charged particles through the heliosphere. The PAMELA experiment, with its long flight ...
The global modulation of cosmic rays during a quiet heliosphere: a modeling perspective
(Elsevier, 2017)
A perspective is given of the solar modulation of galactic cosmic rays in the heliosphere during the extraordinary quiet solar minimum period from 2006 to 2009. This is done in the context of the total modulation of cosmic ...
The heliospheric modulation of cosmic rays: effects of a latitude dependent solar wind termination shock
(Elsevier, 2010)
Observations made with the two Voyager spacecraft confirmed that the solar wind decelerates to form the heliospheric termination shock and that it has begun its merger with the local interstellar medium. The compression ...
Cosmic rays in the dynamic heliosheath
(Elsevier, 2008)
Cosmic ray modulation in the outer heliosphere is discussed from a modeling perspective. Emphasis is on the transport and acceleration of these particles at and beyond the solar wind termination shock in the inner heliosheath ...
Solar cycle variations and cosmic rays
(Elsevier, 2008)
Cosmic rays are excellent indicators of the various solar cycle variations. Galactic and anomalous cosmic rays encounter an outward moving solar wind with cyclic magnetic-field fluctuations and turbulence, which constitute ...