Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh23b1534k&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH23B-1534
Astronomy and Astrophysics
Astrophysics
[7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields
Scientific paper
Radial outflow of magnetized plasma in sunspot penumbrae, the Evershed effect, has a long history of observations and modeling, since its discovery in 1909. There are several different approaches for explaining this phenomenon, but these models cannot describe various observational facts. We have carried out 3D radiative MHD simulations of solar convection in the presence of magnetic field of different strength and inclination. The simulation results show that when the magnetic field is strong (1-2 kG) and highly inclined towards the surface (by 80-85 degrees) the granular convective cells transform into filamentary, flux-tube like structures with strong horizontal velocities. In addition, the convective process takes the form of traveling waves with convective cells moving in the direction of the field inclination. The combination of these two effects, the filamentary structure and the traveling convective waves, result in high-speed, 4-6 km/s, plasma streams, identified in observations as "Evershed clouds". In the case of a very strong magnetic field the streams form coherent structures across the field. The simulation results reproduce many observed features of the Evershed effect, and allow us to establish links with the previous models.
Kitiashvili Irina N.
Kosovichev Aleksandr G.
Mansour Nagi N.
Wray Alan A.
No associations
LandOfFree
The Origin of High-Speed Evershed Flows in Sunspots 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 The Origin of High-Speed Evershed Flows in Sunspots, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Origin of High-Speed Evershed Flows in Sunspots will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1783045