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csillagda szemin�riuma - rendk�v�li szemini�rium eml�keztet�


Chronological Thread 
  • From: uhlar AT konkoly.hu (Karola_Uhlar)
  • To: fizinfo AT lists.kfki.hu
  • Subject: csillagda szeminriuma - rendkvli szeminirium emlkeztet
  • Date: Wed, 25 May 2011 10:37:57 +0200 (CEST)
  • List-archive: <http://mailman.kfki.hu/pipermail/fizinfo>
  • List-id: ELFT HÍRADÓ <fizinfo.lists.kfki.hu>

Meghívó
az MTA Konkoly Thege Miklós Csillagászati Kutatóintézete
szemináriumára

Elõadók: Petrovay Kristóf, Tian Chunlin (Eötvös University, Department of
Astronomy, Budapest)

Cím: The morphology of convection and magnetoconvection in solar and
stellar envelopes

Kivonat:
The talk presents the current status of our understanding of the
geometrical structure of compressible convection in the Sun and stars. In
the simplest case of nonmagnetic convection in a chemically homogeneous
layer this problem was basically solved 20 years ago and recent work only
focused on a better understanding of intermittency and fine structures. In
the understanding of semiconvection a breakthrough has recently been made
by H.C. Spruit et al. in Garching. The study of magnetoconvection is the
subject of ongoing research, realistic simulations being developed in the
MPI Lindau while idealized experimental setups have been studied by Weiss
et al. in Cambridge and recently by our group in Budapest. A common
feature of semiconvection and magnetoconvection is the importance of
subcritical onset of convective transport, making considerations based on
linear stability theory irrelevant for the nonlinear problem. Our most
recent simulations, however, indicate that in the strong field case this
subcritical mode has a structure corresponding more closely to the
so-called "convectons" of nonlinear analytic theory than to the structure
previously found by Weiss et al. The relation of small scale structure
observed in sunspots, such as umbral dots and light bridges, to the
structures seen in the simulations is discussed.

Az elõadás idõpontja: 2011. május 25., szerda 14 óra

Helye: MTA KTM CSKI elõadóterme
Budapest, XII., Konkoly Thege M. út 15-17.



  • csillagda szeminriuma - rendkvli szeminirium emlkeztet, Karola_Uhlar, 05/25/2011

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