Physics – Plasma Physics
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11502203g&link_type=abstract
Journal of Geophysical Research, Volume 115, Issue A2, CiteID A02203
Physics
Plasma Physics
3
Space Plasma Physics: Charged Particle Motion And Acceleration, Space Plasma Physics: Particle Acceleration, Space Plasma Physics: Stochastic Phenomena (3235, 3265, 4475), Magnetospheric Physics: Magnetotail
Scientific paper
A numerical study has been carried out in order to investigate the effects of model time-dependent electromagnetic fields along with stationary, constant electric and magnetic field components on the ion dynamics. In the Earth's magnetotail, the trajectories of thermal protons are integrated in a 2-D model where they can experience a Fermi-like acceleration process by interacting with synthetic oscillating electromagnetic clouds, randomly positioned within the xy plane. Besides the time-dependent fluctuations, a dawn-dusk electric field component E0y is present, as well as a constant out-of-plane magnetic field component Bn. When the size of the electromagnetic clouds is small compared to the simulation box sides, the proton acceleration is mostly due to the dawn-dusk electric field; increasing Bn causes a reduction of the obtained energies, reduction which decreases when Bn is further increased. For larger sizes of the electromagnetic blobs, Fermi acceleration becomes more efficient, and proton energies up to 100 keV are obtained. In such a case, the influence of the constant fields E0y and Bn becomes weak, and the final energy distribution does not depend on Bn. This means that the stochastic Fermi acceleration can be efficient even in the presence of a background magnetic field. Since the typical energies of protons are in good agreement with those observed for proton beams in the Earth's magnetotail, the joint effects of the random fields and the steady ones can explain particle acceleration processes in the distant and the near-Earth magnetotail regions.
Greco Andrés
Perri Simona
Zimbardo Gaetano
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