Cosmic rays & their interstellar medium environment CRISM-2011

Session

Cosmic rays at multiple galactic scales.

Cosmic Ray propagation

29 juin 2011, 09:00

Montpellier, France

24. Cosmic rays and the thermal instability

Prof. Thomas Hartquist (Leeds university)

29/06/2011 09:00

In the absence of magnetic fields and cosmic rays, radiative cooling laws with a range of dependences on temperature affect the stability of interstellar gas. For about four and a half decades, astrophysicists have recognised the importance of the thermal instability for the formation of clouds in the interstellar medium. Even in the past several years, many papers have concerned the role...

52. Alfven Wave Amplification and Self-Containment of Cosmic-Rays Escaping from a Supernova Remnant

Prof. Yutaka Fujita (Osaka University)

29/06/2011 09:35

We study the escape of cosmic-ray (CR) protons accelerated at a supernova remnant (SNR) by numerically solving a diffusion-convection equation from the vicinity of the shock front to the region far away from the front. We consider the amplifications of Alfven waves generated by the escaping CR particles and their effects on CR escape into interstellar medium (ISM). We find that the...

119. Equipartition calculation for supernova remnants

Prof. Dejan Urosevic (Department of mathematics Belgrade University)

29/06/2011 09:55

Equipartition or the minimum-energy calculation is a widespread method for estimating magnetic field strength and energy in the magnetic field and cosmic rays particles by using only the radio synchrotron emission. Despite of its approximate character, it remains a useful tool in situations when no other data about the source are available. We give a modified calculation which we think is...

25. Cosmic ray driven galactic magnetic field dynamo

Dr Michal Hanasz

29/06/2011 10:45

I am going to review recent developments of local and global, galactic-scale numerical models, of the Cosmic-Ray-driven dynamo, which was originally proposed by Parker (1992). The concept of Cosmic-Ray driven MHD dynamo relies on buoyancy forces induced by the presence of cosmic rays in the interstellar medium. The CR-driven dynamo models are realized by means of direct CR-MHD numerical...

116. Magnetic turbulence in the shock precursor and CR acceleration

Dr Beresnyak Andrey (Ruhr University Bochum)

29/06/2011 11:20

We overview recent progress on small-scale dynamo and apply the results to the the problem of nonlinear shock acceleration in which particle mean free paths in front of the shock are greatly reduced due to magnetic fields in the shock precursor which are generated through small-scale dynamo in the density gradient's-induced turbulence. Previous DSA models considered magnetic fields...