Magnetic field generation and electrostatic shock wave formation driven by counter-streaming pair plasmas

Details Magnetic field generation and electrostatic shock wave formation driven by counter-streaming pair plasmas Magnetic field generation and electrostatic shock wave formation driven by counter-streaming pair plasmas

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..669..762h&link_type=abstract

PLASMA PHYSICS: 11th International Congress on Plasma Physics: ICPP2002. AIP Conference Proceedings, Volume 669, pp. 762-765 (2

Physics

Plasma Physics

Shock Waves And Discontinuities, Microinstabilities, Electron-Positron Plasmas, Particle-In-Cell Method, Electrostatic Waves And Oscillations

Scientific paper

By using two-Dimensional (2-D) and 3-D fully electromagnetic and relativistic Particle-In-Cell (PIC) codes, we investigated a collision process of the counter-streaming electron-positron pair plasmas. The collisionless counter-streaming plasmas become unstable against the counter-streaming instability similar to Weibel instability. This instability plays important role in conversion process from particle flow energy to magnetic field energy. We found two kinds of instability in counter-streaming plasmas. The magnetic fields are generated by the electromagnetic counter-streaming instability and the electric fields are formed by the electrostatic two-stream instability. High-energy particles are also produced due to the generated electric fields. In astrophysical plasmas, Gamma-Ray Burst (GRB) can release huge energy over a few seconds in a small volume. It is widely believed that GRB afterglows are observed by synchrotron emission. However, this emission mechanism must require strong magnetic fields in the background. Our simulation results are useful for understanding synchrotron GRB model.

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