On the mean field dynamo with Hall effect

Details On the mean field dynamo with Hall effect On the mean field dynamo with Hall effect

2006-03-14

arxiv.org/abs/astro-ph/0603348v1

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures. Accepted by A&A

Scientific paper

10.1051/0004-6361:20054111

We study in the present paper how Hall effect modifies the quenching process of the electromotive force (e.m.f.) in Mean Field Dynamo (MFD) theories. We write down the evolution equations for the e.m.f. and for the large and small scale magnetic helicity, treat Hall effect as a perturbation and integrate the resulting equations assuming boundary conditions such that the total divergencies vanish. For force-free large scale magnetic fields, Hall effect acts by coupling the small scale velocity and magnetic fields. For the range of parameters considered, the overall effect is a stronger quenching of the e.m.f. than in standard MHD and a damping of the inverse cascade of magnetic helicity. In astrophysical environments characterized by the parameters considered here, Hall effect would produce an earlier quenching of the e.m.f. and consequently a weaker large scale magnetic field.

Affiliated with

Also associated with

No associations

Rating

On the mean field dynamo with Hall effect 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 On the mean field dynamo with Hall effect, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the mean field dynamo with Hall effect will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-704448