Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...680l.153s&link_type=abstract
The Astrophysical Journal, Volume 680, Issue 2, pp. L153-L156.
Astronomy and Astrophysics
Astronomy
5
Acceleration Of Particles, Magnetohydrodynamics: Mhd, Sun: Corona, Sun: Flares, Sun: X-Rays, Gamma Rays
Scientific paper
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.
Ekeberg Jonas
Stasiewicz Krzysztof
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