Browsing Faculty of Natural and Agricultural Sciences by Subject "Heliosphere"
Now showing items 1-10 of 19
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Challenges to cosmic ray modeling: from beyond the solar wind termination shock
(Elsevier, 2008)Voyager 1 crossed the solar wind termination shock on December 16, 2004 at a distance of 94 AU from the Sun, to become the first spacecraft to explore the termination shock region and to enter the heliosheath, the final ... -
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 ... -
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 ... -
Cosmic rays in the dynamic heliosphere
(Japan Society of Plasma Science and Nuclear Fusion Research, 2009)he relation between the dynamics of the heliosphere, its shape and geometry, so lar activity and cosmic ray variations is addressed. The global features of the helio sphere influence what happens inside its boundaries ... -
The dynamic heliosphere, solar activity, and cosmic rays
(Elsevier, 2010)This brief review addresses the relation between solar activity, cosmic ray variations and the dynamics of the heliosphere. The global features of the heliosphere influence what happens inside its boundaries on a variety ... -
A fully time-dependent ab initio cosmic-ray modulation model applied to historical cosmic-ray modulation
(IOP Publishing, 2020)Cosmogenic nuclide records can in principle allow for the estimation of the behavior of the heliospheric magnetic field (HMF) in the distant past. This requires careful modeling of cosmic-ray transport in a manner that is ... -
A generalized Fisk-type HMF: implications of spatially dependent photospheric differential rotation
(IOP Publishing, 2020)The existence of a Fisk-type heliospheric magnetic field (HMF) has been debated ever since Fisk proposed an alternative to the traditional view of the HMF first proposed by Parker. Several modifications of the original ... -
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 ... -
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, ... -
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 ...
