Numerical tests of approximations used in theories for cosmic ray transport

dc.contributor.authorArendt, Victor
dc.contributor.examiningcommitteeFiege, Jason (Physics and Astronomy)en_US
dc.contributor.examiningcommitteeHollander, Hartmut (Civil Engineering)en_US
dc.contributor.supervisorShalchi, Andreas (Physics and Astronomy)en_US
dc.date.accessioned2018-09-11T19:15:22Z
dc.date.available2018-09-11T19:15:22Z
dc.date.issued2018en_US
dc.date.submitted2018-08-20T16:30:25Zen
dc.degree.disciplinePhysics and Astronomyen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractOne of the challenges in astrophysics is describing the motion of cosmic rays in chaotic magnetic fields. I present a qualitative analysis of results from simulations of the motion of cosmic rays in axisymmetric turbulent magnetic fields. A test-particle code was employed using a modified sympletic integration method to calculate the particle trajectories. From the trajectories we calculate the diffusion coefficients along and across the mean field, the particle densities, as well as the particle’s characteristic function and the exact and approximate fourth order velocity correlations which are important in analytical theories describing particle transport across the mean field. We show that having several definitions for the diffusion coefficient can provide insight into the behaviour of those diffusion coefficients as t → ∞. We also show that for early times the parallel characteristic function does not take the form of a Gaussian distribution as assumed in several theories.en_US
dc.description.noteOctober 2018en_US
dc.identifier.urihttp://hdl.handle.net/1993/33309
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectAstrophysicsen_US
dc.subjectCosmic Raysen_US
dc.subjectDiffusionen_US
dc.titleNumerical tests of approximations used in theories for cosmic ray transporten_US
dc.typemaster thesisen_US
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