TITLE

The effect of parallel electric field in shock waves on the acceleration of relativistic ions, electrons, and positrons

AUTHOR(S)
Takahashi, Seiichi; Kawai, Hiromasa; Ohsawa, Yukiharu; Usami, Shunsuke; Chiu, Charles; Horton, Wendell
PUB. DATE
November 2009
SOURCE
Physics of Plasmas;Nov2009, Vol. 16 Issue 11, p112308
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The effect of an electric field E∥ parallel to the magnetic field B on particle acceleration in shock waves is studied. With test particle calculations, for which the electromagnetic fields of shock waves are obtained from one-dimensional, fully kinetic, electromagnetic, particle simulations, the motions of relativistic ions, electrons, and positrons are analyzed. In these simulations, the shock speed vsh is taken to be close to c cos θ, where θ is the angle between the external magnetic field and wave normal, and thus strong particle acceleration takes place. Test particle motions calculated in two different methods are compared: In the first method the total electric field E is used in the equation of motion, while in the second method E∥ is omitted. The comparison confirms that in the acceleration of relativistic ions E∥ is unimportant for high-energy particles. For the acceleration of electrons and positrons, however, E∥ is essential.
ACCESSION #
45515217

 

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