Excitation of Alfven Waves and Pulsar Radio Emission

Details Excitation of Alfven Waves and Pulsar Radio Emission Excitation of Alfven Waves and Pulsar Radio Emission

1999-10-04

arxiv.org/abs/astro-ph/9910068v1

Astronomy and Astrophysics

Astrophysics

12 pages, 2 postscipt figures. submitted to MNRAS

Scientific paper

10.1046/j.1365-8711.2000.03402.x

We analyze mechanisms of the excitation of Alfv\'{e}n wave in pulsar magnetospheres as a possible source of pulsar radio emission generation. We find that Cherenkov excitation of obliquely propagating Alfv\'{e}n waves is inefficient, while excitation at the anomalous cyclotron resonance by the particles from the primary beam and from the tail of the bulk distribution function may have a considerable growth rate. The cyclotron instability on Alfv\'{e}n waves occurs in the kinetic regime still not very closed to the star: $r \geq 50 R_{NS}$. We also discuss various mechanisms of conversion of Alfv\'{e}n waves into escaping radiation. Unfortunately, no decisive conclusion about the effectiveness of such conversion can be made.

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