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Titolo: Relativistic plasma emission and pulsar radio emission: A critique
Autore: Melrose, DB; Gedalin, ME;
- Indirizzi:
- Univ Sydney, Sch Phys, Res Ctr Theoret Astrophys, Sydney, NSW 2006, Australia Univ Sydney Sydney NSW Australia 2006 rophys, Sydney, NSW 2006, Australia Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel Ben Gurion Univ Negev Beer Sheva Israel IL-84105 4105 Beer Sheva, Israel
- Titolo Testata:
- ASTROPHYSICAL JOURNAL
fascicolo: 1,
volume: 521,
anno: 1999,
parte:, 1
pagine: 351 - 361
- SICI:
- 0004-637X(19990810)521:1<351:RPEAPR>2.0.ZU;2-6
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- 2-STREAM INSTABILITY; PAIR PLASMA; LONGITUDINAL-WAVES; PARTICLE MOTION; MAGNETOSPHERES; RADIATION; FIELD; POLARIZATION; MODES; GAPS;
- Keywords:
- plasmas; pulsars : general; radio continuum : stars; relativity;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 64
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Melrose, DB Univ Sydney, Sch Phys, Res Ctr Theoret Astrophys, Sydney, NSW 2006, Australia Univ Sydney Sydney NSW Australia 2006 ey, NSW 2006, Australia
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- Citazione:
- D.B. Melrose e M.E. Gedalin, "Relativistic plasma emission and pulsar radio emission: A critique", ASTROPHYS J, 521(1), 1999, pp. 351-361
Abstract
Relativistic plasma emission due to a beam instability in the polar cap regions is examined critically as a pulsar radio emission mechanism. Wave dispersion in the pulsar plasma is discussed, based on the use of a relativistic plasma dispersion function. The growth rate for the beam instability is estimated in the rest frame of the plasma for parallel Langmuir waves, L-O mode waves, and oblique Alfven waves. The first two of these imply frequencies that are much higher than the observed frequencies for plausible parameters, suggesting that they are not viable as pulsar radio emission mechanisms. Growth of Alfven waves requires that the beam speed equal the phase speed of the Alfven waves, and this condition cannot be satisfied within the light cylinder, except for an extremely high energy beam. It is suggested that either the plasma parameters in the source region are quite different from what is currently considered plausible or the emission mechanism does not involve a beam instability. Alternative pulsar radio emission mechanisms should be explored further.
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Documento generato il 24/05/13 alle ore 03:58:26