Seminars

Wednesday Colloquium

 future talks and archive

The Colloquium takes place every Wednesday at 11:15 AM - Warsaw Copernicus Astronomical Centre (Lecture Theatre), Bartycka 18. The Colloquium is given in English and chaired by dr Stanisław Bajtlik (bajtlik@camk.edu.pl).

10.05.2017
"Magnetic relaxation and turbulence in pulsar wind nebulae"

Jonathan Zrake (Columbia University)

Pulsar wind nebulae (PWNe) are energized by the electromagnetic spin-down power of a rapidly rotating neutron star. Their emission is primarily synchrotron, produced by relativistic electrons radiating in a sub-equipartition magnetic field. The processes by which a pulsar wind, which is born in a strongly magnetized state, eventually shares its energy with electrons, has been a long-standing question in the theory of pulsars and their nebulae (sometimes referred to as the sigma-problem). I will discuss how dissipation in PWNe may be understood in terms of a process known as magnetic relaxation, and give an overview in general physics terms of recent advances in this topic. MHD simulations reveal the process is generally turbulent, and that magnetic field structures tend to organize themselves spatially, even when the field lacks net magnetic helicity. I will discuss how this process helps to explain the magnetization level of the Crab's synchrotron nebula.

 


Special seminars

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No forthcoming seminars.

Journal Club

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Journal Club takes place on Mondays at 11:10 AM in the Barek room. The seminar is given in English and is chaired by Morgane Fortin, Bei You, and Miljenko Cemeljic.

08.05.2017
"An imminent Nova in 2022?"

Janusz Ziółkowski (CAMK, Warsaw)


 


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The Bohdan Paczyński Memorial Colloquium

 

No forthcoming seminars.

 


GeoPlanet Seminars

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No forthcoming seminars.