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Electric potentials and energy fluxes available for particle acceleration by alfvenons in the solar corona
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: Astrophysical Journal Letters, ISSN 2041-8213, Vol. 680, no 2, L153-L156 p.Article in journal (Refereed) Published
Abstract [en]

We show that solitary wave solutions of the one- and two-fluid MHD equations, here called alfvenons, represent two types of electric field structures with negative or positive potentials that can explain the acceleration of particles in the solar corona. Negative potentials are created self-consistently by fast alfvenons and can reach hundreds of kilovolts, which could accelerate the electrons that produce X-ray emissions during flares. Slow alfvenons create positive potential structures of a few kV that accelerate solar wind ions. These alfvenons can be powered by irregular plasma flows in the photosphere and chromosphere, as well as by time-varying magnetic fields during reconnection events at the tops of coronal loops. Similar alfvenon structures are observed in the terrestrial magnetosphere, where they accelerate particles related to aurorae.

Place, publisher, year, edition, pages
2008. Vol. 680, no 2, L153-L156 p.
Keyword [en]
acceleration of particles, MHD, Sun : corona, Sun : flares, Sun : X-rays, gamma rays
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-149370DOI: 10.1086/589878ISI: 000256722600015OAI: oai:DiVA.org:uu-149370DiVA: diva2:404901
Available from: 2011-03-18 Created: 2011-03-18 Last updated: 2011-03-18Bibliographically approved

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