The galactic dynamo effect due to Parker-shearing instability of magnetic flux tubes. III. The fast dynamo model

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Latex, 11 pages, 4 postscript figures, uses l-aa.sty and epsf.sty accepted for publication in Astronomy and Astrophysics

Scientific paper

We present a new fast dynamo model for galactic magnetic fields, which is based on the Parker-shearing instability and magnetic reconnection, in the spirit of the model proposed by Parker (1992). We introduce a new scenario of flux tube interactions and estimate the dynamo transport coefficient basing on simple geometrical arguments. The obtained expressions are equivalent to the formally derived helicity $\alpha_d$ and diffusivity $\eta_d$ in the first paper of this series. The model we propose predicts that the $\alpha$-effect in galactic discs has opposite sign with respect to that resulting directly from the sign of the Coriolis force. We estimate the rate of magnetic heating due to the reconnection of magnetic flux tubes, which plays an important role in our dynamo model. The corresponding luminosities of the diffuse X-ray emission are consistent with the ROSAT observations of nearby galaxies. The present considerations synthesize the ideas of Parker with our own results presented in the preceding papers (Hanasz & Lesch 1993, 1997; Hanasz 1997).

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

The galactic dynamo effect due to Parker-shearing instability of magnetic flux tubes. III. The fast dynamo model 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 The galactic dynamo effect due to Parker-shearing instability of magnetic flux tubes. III. The fast dynamo model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The galactic dynamo effect due to Parker-shearing instability of magnetic flux tubes. III. The fast dynamo model will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-156650

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.