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Abstract
We calculate exact onedimensional collisionless plasma equilibria for a continuum of flux tube models, for which the total magnetic field is made up of the `forcefree' GoldHoyle magnetic flux tube embedded in a uniform and antiparallel background magnetic field. For a sufficiently weak background magnetic field, the axial component of the total magnetic field reverses at some finite radius. The presence of the background magnetic field means that the total system is not exactly forcefree, but by reducing its magnitude the departure from forcefree can be made as small as desired. The distribution function for each species is a function of the three constants of motion; namely the Hamiltonian and the canonical momenta in the axial and azimuthal directions. Poisson's Equation and Amp ere's Law are solved exactly, and the solution allows either electrically neutral or nonneutral configurations, depending on the values of the bulk ion and electron flows. These equilibria have possible applications in various solar, space and astrophysical contexts, as well as in the laboratory.
Original language  English 

Article number  092106 
Number of pages  13 
Journal  Physics of Plasmas 
Volume  23 
Issue number  9 
Early online date  15 Sept 2016 
DOIs  
Publication status  Published  Sept 2016 
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Dive into the research topics of 'Neutral and nonneutral collisionless plasma equilibria for twisted flux tubes: the GoldHoyle model in a background field'. Together they form a unique fingerprint.Projects
 3 Finished

Plasma Theory: Solar and Magnetospheric Plasma Theory
Hood, A. W., Mackay, D. H., Neukirch, T., Parnell, C. E., Priest, E., Archontis, V., Cargill, P., De Moortel, I. & Wright, A. N.
Science & Technology Facilities Council
1/04/13 → 31/03/16
Project: Standard

Equilibrium and Dynamics of Collision: Equilibrium amd Dynamics of Collisionless Current Sheets
1/06/10 → 28/02/14
Project: Standard