Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.174..143l&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 174, no. 1, Dec. 1990, p. 143-150.
Astronomy and Astrophysics
Astrophysics
9
Cosmic Plasma, Crab Nebula, Electromagnetic Radiation, Pulsar Magnetospheres, Wave Propagation, Electrostatic Waves, Extragalactic Radio Sources, Galactic Nuclei, Relativistic Plasmas
Scientific paper
Nonlinear propagation of strong low-frequency waves, as emitted by pulsars or compact galactic nuclei at their rotation frequencies in a magnetized plasma, is investigated. It is shown that even rather small amplitude waves can drive electrons to ultrarelativistic energies. In the limit when the electrons are ultrarelativistic but the ions are immobile, two types of circularly polarized waves (i.e., omega +/- modes) are excited. In the wave zone of the Crab pulsar, both the electric field (about 3 V/m) and the wavelength (about 100 million) of the omega-mode are larger, by an order of magnitude, than those of the omega + wave mode. Both omega +/- modes can become modulationally unstable due to their nonlinear interaction with density fluctuations induced by the electrostatic waves.
Lakhina Gurbax S.
Tsintsadze Nodar L.
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