Study of Energization of a Charged Particle Moving in a Time-dependent Chaotic Magnetic Field

Details Study of Energization of a Charged Particle Moving in a Time-dependent Chaotic Magnetic Field Study of Energization of a Charged Particle Moving in a Time-dependent Chaotic Magnetic Field

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh41b1806c&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH41B-1806

Physics

Plasma Physics

[7839] Space Plasma Physics / Nonlinear Phenomena, [7857] Space Plasma Physics / Stochastic Phenomena, [7863] Space Plasma Physics / Turbulence

Scientific paper

Chaotic magnetic fields are generated in a simple asymmetric configuration where steady state currents flow through a straight wire and a loop, depending on the relative magnitude of the currents. 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 . Thus study of particle motion in a time-dependent chaotic magnetic field is of fundamental importance in space plasma physics and it has profound implications to astrophysical phenomena as the solar flares. For time-dependent currents are electric fields are induced and 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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