Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..587..474p&link_type=abstract
GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP Conference Proceedings, Volume 587, pp. 474-478 (2001).
Astronomy and Astrophysics
Astrophysics
1
Physical Properties, Radiation Mechanisms, Polarization, Planetary Bow Shocks, Interplanetary Shocks
Scientific paper
To address the important issue of how kinetic energy of collimated blast waves is converted into radiation, Pohl and Schlickeiser [1] have recently investigated the relativistic two-stream instability of electromagnetic turbulence. They have shown that swept-up matter is quickly isotropized in the blast wave, which provides relativistic particles and, as a result, radiation. Here we present new calculations for the electrostatic instability in such systems. It is shown that the electrostatic instability is faster than the electromagnetic instability for highly relativistic beams. However, even after relaxation of the beam via the faster electrostatic turbulence, the beam is still unstable with respect to the electromagnetic waves, thus providing the isotropization required for efficient production of radiation. While the emission spectra in the model of Pohl and Schlickeiser have to be modified, the basic characteristics persist. .
Lerche Ian
Pohl Martin
Schlickeiser Reinhard
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