Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-04-23
Astrophys.J.700:L178-L181,2009
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
12 pages, 5 figures; submitted to ApJ Letters
Scientific paper
10.1088/0004-637X/700/2/L178
Discovered in 1909 the Evershed effect represents strong mass outflows in sunspot penumbra, where the magnetic field of sunspots is filamentary and almost horizontal. These flows play important role in sunspots and have been studied in detail using large ground-based and space telescopes, but the basic understanding of its mechanism is still missing. We present results of realistic numerical simulations of the Sun's subsurface dynamics, and argue that the key mechanism of this effect is in non-linear magnetoconvection that has properties of traveling waves in the presence of strong, highly inclined magnetic field. The simulations reproduce many observed features of the Evershed effect, including the high-speed "Evershed clouds", the filamentary structure of the flows, and the non-stationary quasi-periodic behavior. The results provide a synergy of previous theoretical models and lead to an interesting prediction of a large-scale organization of the outflows.
Kitiashvili Irina N.
Kosovichev Alexander G.
Mansour Nagi N.
Wray Alan A.
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