Large Scale Magnetic Diffusion on the Sun

Details Large Scale Magnetic Diffusion on the Sun Large Scale Magnetic Diffusion on the Sun

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp51b10l&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP51B-10

Physics

7524 Magnetic Fields, 7544 Stellar Interiors And Dynamo Theory

Scientific paper

Existing models for the evolution of the large scale solar magnetic field invoking the diffusion of magnetic flux typically require diffusion coefficients of roughly 600\ {km}2 {s}-1 to match observed long term behavior. This value is typically 2-3 times larger than the diffusion coefficients derived from detailed observations of the motion of small scale intensity or magnetic features. We explore the idea that large scale magnetic diffusion is tied to motions well below the photosphere, where turbulent diffusivities are likely to be substantially greater than surface values. Our hypothesis is that magnetic flux evolution is tied to convective motions at the depth where ``dynamic disconnection'' of active region magnetic flux tubes occurs. Dynamic disconnection occurs at the depth in the solar convection zone where the condition of hydrostatic equilibrium within an emerged Ω loop becomes incompatible with the assumption of adiabatic magnetic flux emergence. This leads to dispersion at that depth of the magnetic field originally in the active region Ω loop. We estimate the turbulent diffusion coefficient at dynamic disconnection depths by using a simple mixing length description of convective motions taken from a solar interior model of Christensen-Dalsgaard. Preliminary results indicate turbulent diffusion coefficients that are greater or equal to those observed.

Affiliated with

Also associated with

No associations

Rating

Large Scale Magnetic Diffusion on the Sun 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 Large Scale Magnetic Diffusion on the Sun, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Large Scale Magnetic Diffusion on the Sun will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1279544