Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...2e..49j&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
Conventional ideas regarding plasma instabilities suggest that the polarisation of pulsar radio emission should be dominated by that corresponding to the fastest growing mode. The presence of two distinct polarisations, indicating emission in two distinct modes, is, however, almost ubiquitous in observations of these objects. In order to reconcile the basic theory with the observations it has been proposed that energy is exchanged between the natural modes of the plasma as the radiation propagates through the magnetosphere of the pulsar. The basic theory of mode-coupling in stratified media has already been developed in work relating to wave propagation in the ionosphere and the solar corona. Here, this formalism is applied to a relativistically streaming plasma and gradients in the plasma perpendicular to the direction of the local magnetic field are investigated as a possible mechanism for effective mode-coupling in a pulsar magnetosphere.
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