Browsing Faculty of Natural Sciences@PUK by Subject "diffusion"
Now showing items 110 of 18

An AB initio model for cosmicray modulation
(IOP Science, 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 cosmicray electrons
(IOP Science, 2013)The modulation of galactic cosmicray electrons is studied using an ab initio threedimensional steady state cosmicraymodulation code in which the effects of turbulence on both the diffusion and drift of these cosmicrays ... 
A comparison of turbulencereduced drift coefficients of importance for the modulation of galactic cosmicray 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 ... 
Cosmicray modulation: an ab initio approach
(Springer Verlag, 2014)A better understanding of cosmicray 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 cosmicray positron anisotropy due to two middleaged, 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 spindown powers of the order 3 × 1034 ergs s–1 at present. The winds of these pulsars had most probably ... 
The effect of a dynamic inner heliosheath thickness on cosmicray modulation
(American Astronomical Society, 2015)The timedependent modulation of galactic cosmic rays in the heliosphere is studied over different polarity cycles by computing 2.5 GV proton intensities using a twodimensional, timedependent modulationmodel. By ... 
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, fieldaligned frame. We reexamine the ... 
Is the highest cosmicray flux yet to come?
(Springer Verlag, 2014)The recent 2009 solarminimum period was characterized by a recordsetting high Galactic cosmicray flux observed at Earth. This, along with the unexpected low heliospheric magneticfield 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 cosmicray modulation and can explain the peaked versus flat intensity profiles during consecutive solar magnetic epochs. Modulation ... 
Modeling the modulation of galactic and jovian electrons by stochastic processes
(IOP Publishing, 2011)We present a newly developed numerical modulation model to study the transport of galactic and Jovian electrons in the heliosphere. The model employs stochastic differential equations (SDEs) to solve the corresponding ...