Thermal Generation of Alfvén Waves in Oscillatory Magnetoconvection: Diffusively Modified Modes

Details Thermal Generation of Alfvén Waves in Oscillatory Magnetoconvection: Diffusively Modified Modes Thermal Generation of Alfvén Waves in Oscillatory Magnetoconvection: Diffusively Modified Modes

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002gapfd..96..405w&link_type=abstract

Geophysical and Astrophysical Fluid Dynamics, vol. 96, Issue 5, p.405-424

Physics

Fluid Dynamics

4

Scientific paper

Thermal instabilities in the form of oscillatory magnetoconvection representing diffusively modified Alfvén waves in an electrically-conducting Bénard fluid layer of rigid walls in the presence of a vertical magnetic field are investigated. Emphasis of the article is on the transition from a nearly undamped Alfvén wave to diffusively modified Alfvén waves, and on the effect of physically realisable magnetic field boundary conditions on magnetoconvection. It is found that the extra magnetic dissipation in the magnetic Hartmann boundary layers can enhance oscillatory magnetoconvection in the form of strongly modified Alfvén waves. Oscillatory magnetoconvection produced solely by the Alfvén wave mechanism can be the most unstable mode even in the presence of a strong viscous effect. This article also represents the first study on the effect of an electrically conducting wall on magnetoconvection which is associated with a nonlinear eigenvalue problem. We find that the electrically perfectly conducting condition does not yield a good approximation for magnetoconvection with an electrically highly conducting wall. The size of oscillation frequency with an electrically highly conducting wall can be more than a factor of 2 larger than that obtained using the perfectly conducting condition.

Affiliated with

Also associated with

No associations

Rating

Thermal Generation of Alfvén Waves in Oscillatory Magnetoconvection: Diffusively Modified Modes 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 Thermal Generation of Alfvén Waves in Oscillatory Magnetoconvection: Diffusively Modified Modes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal Generation of Alfvén Waves in Oscillatory Magnetoconvection: Diffusively Modified Modes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1515311