Large scale magnetic fields in discs: advection and jet launching

Details Large scale magnetic fields in discs: advection and jet launching Large scale magnetic fields in discs: advection and jet launching

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1242..276f&link_type=abstract

PLASMAS IN THE LABORATORY AND THE UNIVERSE: Interactions, Patterns, and Turbulence. AIP Conference Proceedings, Volume 1242, pp

Mathematics

Logic

Jets, Magnetic Field Effects, X-Ray Binary Stars, Accretion Disks, Jets, Outflows, And Bipolar Flows, Magnetic Fields And Magnetism, X-Ray Binaries, Infall, Accretion, And Accretion Disks

Scientific paper

Large scale magnetic fields are the fundamental key ingredient for both jet collimation and production. However, their presence is still a mystery: are they generated by a dynamo or simply advected?
We start by quickly reviewing the physics of jet launching from quasi keplerian (thin) discs. It will be shown that the only available solutions of powerful jets require fields close to (but smaller than) equipartition. All these solutions rely on a crude phenomenological local description of turbulence (alpha prescription). However, despite this caveat, they seem to be consistent with several observational constraints such as mass loss rates and kinematics of jets from young stars.
The interplay between turbulent diffusion and advection is then addressed by 2.5 D simulations done with the MHD code PLUTO. It is shown that advection can indeed occur above a threshold on the disc magnetization. Our results shed a new light on the long term evolution of accretion discs by putting more emphasis on the magnetic history of each particular object. This has strong implications on the understanding of hysteresis cycles seeing in X-ray binaries.

Affiliated with

Also associated with

No associations

Rating

Large scale magnetic fields in discs: advection and jet launching does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Large scale magnetic fields in discs: advection and jet launching, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Large scale magnetic fields in discs: advection and jet launching will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1347019