Global magnetic shear instability in spherical geometry

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

24

Accretion, Accretion Discs, Instabilities, Mhd, Stars: Magnetic Fields

Scientific paper

This paper concerns the global stability of a differentially rotating magnetized sphere of an incompressible fluid. Rotation laws subcritical to the Rayleigh stability criterion produce the instability in the finite interval B_min<=B<=B_max of the magnetic field amplitudes. The upper, B_max, and the lower, B_min, bounds are imposed by the finite size of the system and by finite diffusivities (magnetic resistivity and viscosity), respectively. For high rotation rates, B_max grows linearly with the angular velocity gradient while B_min approaches a constant value. The global modes with different types of symmetry relative to the equatorial plane are identified. The modes with symmetric magnetic field and antisymmetric flow are always dominating. Non-axisymmetric excitations are preferred when rotation is not too slow and the field strength is close to B_max. The possibility of a hydromagnetic dynamo produced by the instability in stellar radiative cores is briefly discussed.

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

Global magnetic shear instability in spherical geometry 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 Global magnetic shear instability in spherical geometry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Global magnetic shear instability in spherical geometry will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1320332

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