Gunn, Alastair G

Contact Email: agg@jb.man.ac.uk
Institute: University of Manchester
Jodrell Bank Observatory Macclesfield Cheshire SK11 9DL United Kingdom
First Coauthor: P. A. Brady
Subject Area: Stellar Atmospheres, Circumstellar Material
Waveband: Radio
Technique: Computational Astrophysics
Presentation: Poster Display
Title: A generalised 3-dimensional model of gyrosynchrotron emission from magnetic structures on active stars
Abstract: We have completed development of a rigorous computational model of gyrosynchrotron radio emission from generalised field structures in active stellar coronae. The model describes the total integrated flux from a magnetic structure through an inhomogeneous medium. Any 3-dimensional field topology can be modelled but we have applied it in the first instance to a generalised magnetic loop structure. The investigation has focussed on the effects of viewing angle, loop geometry, electron density and magnetic field strength on the radio brightness distribution and radio emission spectrum. Our results show that, not only is the observed radio flux critically dependent on viewing angle, in a non-intuitive manner, but that viewing angle also effects the overall spectral distribution. These results have important consequences for the interpretation of radio light-curves and radio spectra from active stars.