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Upcoming Colloquium


 国家天文台2019年度报告NO.11

  • Title /  报告题目Mechanism of Pulsar Radio Emission
  • Speaker/ 报告人: Prof. R. T. Gangadhara (Indian Institute of Astrophysics)
  • Venue/报告地点:A601, NAOC
  • Date / 报告时间:June 19(Wednesday), 14:30pm
  • Live Webcast/直播链接:Scan QR code below to watch the live broadcast
  • Abstrac / 报告摘要:Pulsars provide a clear case of coherent radio emission among celestial bodies. But the mechanism of coherent emission is still an outstanding problem. The observation of very high brightness temperature 1025 – 1033K of radio pulsars imply that the emission is coherent. In a pulsar magnetosphere the relativistic plasma accelerated along the dipolar magnetic field is believed to produce the radio waves. The problem of pulsar radio emission has been addressed in terms of both incoherent and coherent emission models. Though the incoherent radio emission models have been well developed, they have been only partially successful in explaining some of the pulsar profile characteristics such as pulse shapes and polarization. However the pulsar radio emission is intrinsically extremely bright, and it requires an emission mechanism that is coherent because incoherent emission, in which each of the particles radiate independently of the others, is totally inadequate. The collective plasma radiation process is believed act coherently on a time scale of microseconds and below in generating pulsar radio waves. The pulsar radio emission is believed to arise due to growth of plasma instabilities in the relativistic secondary electron-positron plasma, which is bunched and streaming out along the curved open dipolar magnetic field lines.
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Colloquium 2019

Please suggest colloquium speakers and encourage your visitors to give talks. The talks should be diversified, covering all research topics within NAOC. The talks should be aimed at the general audience, allowing generous introductions (15 minutes) so that other people not in the same field can follow (to some extent).

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