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Dispersive MHD waves and alfvenons in charge non-neutral plasmas
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
2008 (English)In: Nonlinear processes in geophysics, ISSN 1023-5809, E-ISSN 1607-7946, Vol. 15, no 4, 681-693 p.Article in journal (Refereed) Published
Abstract [en]

Dispersive properties of linear and nonlinear MHD waves, including shear, kinetic, electron inertial Alfven, and slow and fast magnetosonic waves are analyzed using both analytical expansions and a novel technique of dispersion diagrams. The analysis is extended to explicitly include space charge effects in non-neutral plasmas. Nonlinear soliton solutions, here called alfvenons, are found to represent either convergent or divergent electric field structures with electric potentials and spatial dimensions similar to those observed by satellites in auroral regions. Similar solitary structures are postulated to be created in the solar corona, where fast alfvenons can provide acceleration of electrons to hundreds of keV during flares. Slow alfvenons driven by chromospheric convection produce positive potentials that can account for the acceleration of solar wind ions to 300-800 km/s. New results are discussed in the context of observations and other theoretical models for nonlinear Alfven waves in space plasmas.

Place, publisher, year, edition, pages
2008. Vol. 15, no 4, 681-693 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-149305ISI: 000259989200018OAI: oai:DiVA.org:uu-149305DiVA: diva2:404439
Available from: 2011-03-17 Created: 2011-03-17 Last updated: 2017-12-11Bibliographically approved

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