Particle Motion and Energization in a Chaotic Magnetic Field

Details Particle Motion and Energization in a Chaotic Magnetic Field Particle Motion and Energization in a Chaotic Magnetic Field

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1183..201l&link_type=abstract

SHOCK WAVES IN SPACE AND ASTROPHYSICAL ENVIRONMENTS: 18th Annual International Astrophysics Conference. AIP Conference Proceedin

Astronomy and Astrophysics

Astrophysics

Interstellar Matter, Cosmic Rays, Fokker-Planck Equation, Solar Flares, Interplanetary Magnetic Fields, Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus, Cosmic Rays, Fokker-Planck And Vlasov Equation, Flares, Interplanetary Magnetic Fields

Scientific paper

In nature there are many systems where macroscopic and time varying currents exist. For example, in solar flares, currents in the form of filaments and/or loops have been observed. In a simple asymmetric configuration where steady state currents flow through a straight wire and a loop, a somewhat surprising feature is that the resulting magnetic field can become chaotic depending on the relative size of the currents. This implies that studying particle motion in a time-dependent chaotic magnetic field is a fundamental problem in space plasma physics and it has profound implications to astrophysical phenomena as the solar flares. Because these currents are time dependent, they induce electric fields. Consequently, electrons and ions moving in the field can experience alternating acceleration and deceleration, leading to a second order Fermi acceleration. We discuss here charged particle motion in a chaotic magnetic fields and the energization process. Particle trajectories are obtained by following single particle motion using the Lorentz equation by a 4-th order Runge-Kutta scheme. Implications of our results to particle acceleration and heating at a flare site are discussed.

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