4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
The Proceedings of SAIP2016 published on 24 December 2017
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Long-term cosmic-ray modulation model: A simplified ab initio approach

Presented by Mr. KATLEGO MOLOTO on 6 Jul 2016 from 11:10 to 11:30
Type: Oral Presentation
Session: Space Science
Track: Track D2 - Space Science

Abstract

A simplified ab initio approach is followed to model long-term cosmic-ray modulation using a steady-state three-dimensional numerical code. Standard diffusion coefficients based on Quasilinear Theory (QLT) and Nonlinear Guiding Center Theory (NLGC) are used. The spatial dependence of turbulence quantities required as input for the drift- and diffusion coefficients follow from parametric fits to results from a turbulence transport model. The temporal behavior of these quantities is based on the magnetic variance. Effective values are used for the solar wind speed, magnetic field magnitude and tilt angle in the modulation model. Fairly accurate fits for the cosmic-ray spectra for the 1987, 1997 and the 2009 solar minima are obtained

Award

yes

Level

PhD

Supervisor

Prof Adri Burger Adri.Burger@nwu.ac.za NWU

Paper

No

Permission

yes

Place

Location: Kramer Law building
Address: UCT Middle Campus Cape Town
Room: 5B


Primary authors

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