Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...360..151k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 360, Sept. 1, 1990, p. 151-172.
Astronomy and Astrophysics
Astrophysics
6
Dynamo Theory, Interstellar Magnetic Fields, Interstellar Matter, Kinematic Equations, Star Formation, Astronomical Models, Magnetic Flux, Magnetohydrodynamic Turbulence, Time Dependence
Scientific paper
During an active star formation epoch the interstellar medium of a galaxy is in a hyperactive state, and the average turbulent velocity is higher than in the long periods between star formation epochs. The galactic magnetic field generated by dynamo action depends strongly on the turbulent velocity, so that generation of magnetic field should vary with star formation activity. This paper is a preliminary study of the kinematic dynamo equation with time-dependent coefficients simulating the time dependence of the star formation activities. Ko and Parker argued in a simple model that the thickness of the dynamo region is the most sensitive dynamo parameter. The present work shows that the effect of inflating the galactic disk suddenly is to transform a stationary magnetic field into a growing field while keeping the profile more or less intact. Plane wave solutions for a dynamo with power-law time-dependent parameters show that the field may decay first and then grow, and vice versa, which is quite different from a constant parameter dynamo.
No associations
LandOfFree
A study of the kinematic dynamo equation with time-dependent coefficients 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 A study of the kinematic dynamo equation with time-dependent coefficients, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A study of the kinematic dynamo equation with time-dependent coefficients will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1401004