Abstract
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 Ti is higher than the electron temperature Te and that of ion acoustic waves whenTe >Ti. In each case the corresponding growth rate for low-frequency acoustic waves induced by a high-frequency photon beam is evaluated. For Ti > Te, the maximum growth rate for electron acoustic waves depends strongly on Ti/Te and may be comparable to that of a Langmuir counterpart for sufficiently large temperature ratio Ti/Te. It is shown that induced scattering off electron acoustic waves can be important and can cause pulsar eclipse. We show also that for Te > Tiand 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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