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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20091020T000000
DTEND;TZID=Atlantic/Canary:20091020T010000
UID:iactalks-192
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/192
CREATED:2009-10-20T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Radiative MHD simulations of sunspot structure
DESCRIPTION:Radiative MHD simulations of sunspot structure\nProf. Matthias 
 Rempel\n\nFor a long time radiative MHD simulations of entire sunspots fro
 m first principles were out of reach due to insufficient computing resourc
 es. Over the past 4 years simulations have evolved from 6x6x2 Mm size doma
 ins focusing on the details of umbral dots to simulations covering a pair 
 of opposite polarity sunspots in a 100x50x6 Mm domain. In this talk I will
  discuss the numerical challenges encountered in comprehensive radiative M
 HD simulations of active regions and summarize the recent progress. Numeri
 cal simulations point toward a common magnetoconvective origin of umbral d
 ots and filaments in the inner and outer penumbra. Most recent simulations
  also capture the processes involved in the formation of an extended outer
  penumbra with strong horizontal outflows averaging around 5 km/s in the p
 hotosphere.\nI will discuss in detail the magneto convective origin of pen
 umbral fine structure as well as the Evershed flow. I will conclude with a
  brief summary of recent helioseismic studies based on realistic MHD simul
 ations as well as inferences on the sub surface structure of sunspots.\n
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