Supergranule Diffusion and Active Region Decay

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

1

Scientific paper

Models of the Sun's magnetic dynamo include turbulent diffusion to parameterize the effects of convective motions on the evolution of the Sun's magnetic field. Supergranules are known to dominate the evolution of the surface magnetic field structure as evidenced by the structure of both the active and quiet magnetic network. However, estimates for the diffusivity attributed to supergranules differ by an order of magnitude - from about 100 km2/s to more than 1000 km2/s. We examine this question of the diffusivity using three different approaches. 1) We study the decay of more than 30,000 active regions by determining the rate of change in the sunspot area of each active region from day-to-day. 2) We study the decay of a single isolated active region near the time of solar minimum by examining the magnetic field evolution over five solar rotations from SOHO/MDI magnetograms obtained at 96-minute intervals. 3) We study the characteristics of supergranules that influence the estimates of their diffusive properties - flow speeds and lifetimes as functions of size ˜V from SOHO/MDI Dopplergrams.

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

Supergranule Diffusion and Active Region Decay 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 Supergranule Diffusion and Active Region Decay, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Supergranule Diffusion and Active Region Decay will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1172063

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