Modulational Instability, Mode Conversion, and Radio Emission in the Magnetized Pair Plasma of Pulsars

Details Modulational Instability, Mode Conversion, and Radio Emission in the Magnetized Pair Plasma of Pulsars Modulational Instability, Mode Conversion, and Radio Emission in the Magnetized Pair Plasma of Pulsars

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...483..402w&link_type=abstract

Astrophysical Journal v.483, p.402

Astronomy and Astrophysics

Astronomy

27

Instabilities, Plasmas, Stars: Pulsars: General, Radiation Mechanisms: Nonthermal

Scientific paper

A theoretical analysis of coupled mode equations describes the evolution of plasma wave turbulence in the strongly magnetized pair plasma of the pulsar polar cap. The onset of turbulence is a modulational instability of a large-amplitude electrostatic wave. Numerical solution follows the nonlinear evolution toward a strongly turbulent state characterized by the multidimensional collapse of wave packets. The turbulence generates electromagnetic modes that can escape the plasma. The modulational conversion process provides a fairly simple scenario for pulsar emission: an electrostatic plasma wave instability and the subsequent modulational mode coupling to escaping radiation.

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