Fast dynamos in weakly ionized gases

Details Fast dynamos in weakly ionized gases Fast dynamos in weakly ionized gases

2008-05-05

arxiv.org/abs/0805.0412v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ

Scientific paper

The turnover of interstellar gas on $\sim 10^9$yr timescales argues for the continuous operation of a galactic dynamo. The conductivity of interstellar gas is so high that the dynamo must be "fast" - i.e. the magnetic field must be amplified at a rate nearly independent of the magnetic diffusivity. Yet, all the fast dynamos so far known - and all direct numerical simulations of interstellar dynamos - yield magnetic power spectra that peak at the resistive scale, while galactic magnetic fields have substantial power on large scales. In this paper we show that in weakly ionized gas the limiting scale may be the ion-neutral decoupling scale, which although still small is many orders of magnitude larger than the resistive scale.

Affiliated with

Also associated with

No associations

Rating

Fast dynamos in weakly ionized gases 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 Fast dynamos in weakly ionized gases, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fast dynamos in weakly ionized gases will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-208337