Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...2e..41s&link_type=abstract
On the Present and Future of Pulsar Astronomy, 26th meeting of the IAU, Joint Discussion 2, 16-17 August, 2006, Prague, Czech Re
Astronomy and Astrophysics
Astronomy
Scientific paper
We study extremely nonlinear, coherent electromagnetic waves in the context of relativistic, expanding plasma flows, where a confining external medium triggers the formation of a shock. Using a combination of analytical methods and Particle-In-Cell simulations, we discuss mechanisms of wave generation and dissipation, as well as how the waves affect the particle distribution. For a large-amplitude wave of general polarisation, any given set of wave parameters uniquely fixes the particle and energy flux associated with the flow. In cases where the wave properties can be constrained, this can be used to estimate the flow parameters. The prime application of our work is to pulsar winds and pulsar wind termination shocks, where our model provides a viable alternative to magnetohydrodynamic models. Using canonical parameters for the Crab, we discuss mode couplings and transitions between the inner and outer parts of the wind, and use simulation data to shed new light on the microphysics of the wave as it reaches the shock.
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