Pulsar eclipsing mechanisms: the effect of photon-beam-induced acoustic turbulence

Details Pulsar eclipsing mechanisms: the effect of photon-beam-induced acoustic turbulence Pulsar eclipsing mechanisms: the effect of photon-beam-induced acoustic turbulence

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.289...52l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 289, Issue 1, pp. 52-58.

Astronomy and Astrophysics

Astronomy

5

Plasmas, Radiation Mechanisms: Non-Thermal, Scattering, Turbulence, Stars: Neutron, Pulsars: General

Scientific paper

Pulsar eclipse due to induced three-wave interactions involving low-frequency acoustic turbulence is discussed. We consider both the case of electron acoustic waves when the ion temperature T_i is higher than the electron temperature T_e and that of ion acoustic waves when T_e>T_i. In each case the corresponding growth rate for low-frequency acoustic waves induced by a high-frequency photon beam is evaluated. For T_i>T_e, the maximum growth rate for electron acoustic waves depends strongly on T_i/T_e and may be comparable to that of a Langmuir counterpart for sufficiently large temperature ratio T_i/T_e. It is shown that induced scattering off electron acoustic waves can be important and can cause pulsar eclipse. We show also that for T_e>T_i and in the small-angle approximation, growth of low-frequency ion acoustic waves due to the photon beam is always slower than Langmuir waves and the corresponding induced scattering is less effective than induced Raman scattering. Thus, induced Brillouin scattering involving low-frequency ion acoustic waves cannot be the main cause for pulsar eclipses.

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