Physics – Plasma Physics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..dpp.q7f11w&link_type=abstract
American Physical Society, Division of Plasma Physics Meeting, November 16-20, 1998 New Orleans, LA, abstract #Q7F.11
Physics
Plasma Physics
Scientific paper
Turbulence in the strongly magnetized pair plasma near the pulsar polar cap is modeled as ordinary-branch wavemodes coupled through density perturbations of the refractive index. The natural frequencies of the waves of interest are near the local pair-plasma frequency. The energization of waves begins with a streaming instability, and proceeds towards turbulence by modulational wave-wave coupling. Turbulence provides a mechanism to convert the electrostatic energy in the streaming instability to electromagnetic modes which can escape the plasma as pulsar radio emission. Numerical solution of coupled mode equations shows the development of an oscillating-two-stream interaction, which intensifies into filamentation of the initial streaming mode, and collapse into localized regions of high electric field. The rapid onset of turbulence allows the electrostatic energy stored in the plasma to be released into radiation on the timescale of the light crossing time of the pulsar polar cap. The numerical analysis details the time structure of an individual burst of radiation on nanosecond timescales. Specific temporal signatures, including nonlinear recurrence and deterministic chaos are displayed by this model. Attempts are made to identify these characteristics in radio data. Supported by NSF grants AST-9618408 and AST-9720263.
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