Particle-in-cell simulations of electron acceleration by a simple capacitative antenna in collisionless plasma

Details Particle-in-cell simulations of electron acceleration by a simple capacitative antenna in collisionless plasma Particle-in-cell simulations of electron acceleration by a simple capacitative antenna in collisionless plasma

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10912304d&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue A12, CiteID A12304

Physics

Plasma Physics

Ionosphere: Particle Acceleration, Ionosphere: Wave/Particle Interactions, Space Plasma Physics: Experimental And Mathematical Techniques

Scientific paper

We examine the electron acceleration by a localized electrostatic potential oscillating at high frequencies by means of particle-in-cell (PIC) simulations, in which we apply oscillating electric fields to two neighboring simulation cells. We derive an analytic model for the direct electron heating by the externally driven antenna electric field, and we confirm that it approximates well the electron heating obtained in the simulations. In the simulations, transient waves accelerate electrons in a sheath surrounding the antenna. This increases the Larmor radii of the electrons close to the antenna, and more electrons can reach the antenna location to interact with the externally driven fields. The resulting hot electron sheath is dense enough to support strong waves that produce high-energy sounder-accelerated electrons (SAEs) by their nonlinear interaction with the ambient electrons. By increasing the emission amplitudes in our simulations to values that are representative for the ones of the sounder on board the OEDIPUS C (OC) satellites, we obtain electron acceleration into the energy range which is comparable to the 20 keV energies of the SAE observed by the OC mission. The emission also triggers stable electrostatic waves oscillating at frequencies close to the first harmonic of the electron cyclotron frequency. We find this to be an encouraging first step of examining SAE generation with kinetic numerical simulation codes.

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