July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Cosmic ray modulation as a possible diagnostic for the low-wavenumber behaviour of turbulence in the heliospheric magnetic field

Aug 5, 2015, 3:00 PM
15m
Mississippi (World Forum)

Mississippi

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution SH-TH Parallel SH 09 Modulation II

Speaker

Nicholas Eugene Engelbrecht (SANSA)

Description

Galactic cosmic-ray (CR) intensities calculated using numerical modulation models that proceed from first principles, where the diffusion tensor is calculated using as inputs observationally motivated forms for the heliospheric turbulence power spectrum as function of turbulence quantities yielded by turbulence transport models, are incredibly sensitive to assumptions made as to the low-wavenumber behaviour of the 2D turbulence power spectrum. In this study, a novel *ab initio* CR modulation code that solves a set of stochastic transport equations equivalent to the Parker transport equation is introduced, and employed to study this sensitivity. Preliminary results, including those pertaining to possible constraints on the low-wavenumber behaviour of the 2D power spectrum gleaned from computed CR spectra, will also be presented.
Registration number following "ICRC2015-I/" 117
Collaboration -- not specified --

Primary author

Co-author

Prof. Renier Adriaan Burger (Center for Space Research, North-West University (Potchefstroom campus))

Presentation materials

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