Magnetohydrodynamics of stellar interiors

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Workshop theme

Supported by the European Commission, Sixth Framework Programme - Marie Curie Conferences and Training Courses - MSCF-CT-2003-503674

Magnetic activity in a star like the Sun gives rise to dark spots, bright flares, mass ejections, dramatically enhanced radiation (from the radio to the EUV and X-ray), and copious production of highly accelerated particles, all of which are caused by fields generated in the star's interior. The course will cover the interaction between convection, rotation and magnetic fields in solar-type stars with deep outer convection zones. The aim will be to confront theory with observations. This is timely because new observations (from space and from the ground) are revealing fine details of surface features, while helio- and astero- seismology provide a means of probing stars' internal structure. Meanwhile, theoretical models are becoming more realistic and sophisticated, and the availability of ever more powerful computers has at last made it feasible to model nonlinear processes in sufficient detail. These results are explained by reference to precise mathematical models, describing the essential processes that are involved, and there is a strong overlap with nonlinear dynamics, including bifurcation theory and pattern formation.

The programme will contain lectures by leading figures that will cover a full range of theoretical topics, including solar magnetic fields, stellar activity, helioseismology and asteroseismology, protostellar activity, brown dwarfs, magnetoconvection, magnetoturbulence, shear and differential rotation, dynamos, stellar magnetic activity, cycles and grand minima, together with a survey of relevant observations and experiments.

There will also be opportunities for further shorter presentations.

Timetable

Monday 6th September 2004
11:30 to 12:35	Robert Rosner University of Chicago Stellar magnetic activity (overview)	Room 1
15:30 to 16:40	Introduction to MHD and dynamo theory I	Room 1
16:40 to 17:05	Nathan Kleeorin Universal mechanism of dynamo saturation:dynamics of magnetic helicity	Room 1
17:05 to 17:30	Finite amplitude convection in rotating spherical fluid shells and its Prandtl number dependence	Room 1

Tuesday 7th September 2004
09:00 to 10:10	Introduction to MHD and dynamo theory II	Room 1
10:10 to 10:35	Igor Rogachevskii Ben-Gurion University Effect of differential rotation on nonlinear mean electromotive force and stellar dynamos	Room 1
10:35 to 11:00	Rainer Arlt Magneto-rotational instability in the solar core and Ap star envelopes	Room 1
11:25 to 12:30	Douglas Gough University of Cambridge What we know about stellar interiors (overview)	Room 1
15:30 to 16:40	Alan Title LMSAL Observations of magnetic fields on the Sun I	Room 1
16:40 to 17:05	Alexander Voegler Decay of a simulated bipolar magnetic field in the solar surface layers	Room 1
17:05 to 17:30	Heating the stellar plasma in the transitional region from the inductive to drift freezing of magnetic field	Room 1

Wednesday 8th September 2004
09:00 to 10:10	Andrew Collier Cameron University of St Andrews Magnetic activity in rapidly rotating stars I	Room 1
10:10 to 10:35	Antonio Ferriz-Mas Universidad de Vigo Influence of external flows on the stability of magnetic flux tubes in a stellar convection zone	Room 1
10:35 to 11:00	Oskar Steiner Connecting solar irradiance variability to the solar dynamo using the virial theorem	Room 1
11:25 to 12:35	Alan Title LMSAL Observations of magnetic fields on the Sun II	Room 1

Thursday 9th September 2004
09:00 to 10:10	Andrew Collier Cameron University of St Andrews Magnetic activity in rapidly rotating stars II	Room 1
10:10 to 10:35	Reza Tavakol Dynamo models and differential rotation in sun and stars	Room 1
10:35 to 11:00	David Galloway University of Sydney Different limiting mechanisms for nonlinear dynamos	Room 1
11:25 to 12:35	Magnetoconvection I	Room 1
15:30 to 16:40	Young stars I	Room 1
16:40 to 17:05	Localised states in magnetoconvection	Room 1
17:05 to 17:30	Francois Rincon Observatoire Midi-Pyrenees Large scale simulations of compressible convection	Room 1

Friday 10th September 2004
09:00 to 10:10	Magnetoconvection II	Room 1
10:00 to 10:35	Paul Bushby University of Cambridge Modelling photospheric magnetoconvection in the weak field regime	Room 1
10:35 to 11:00	Aake Nordlund Current status of facular region and sunspot models	Room 1
11:25 to 12:35	Young stars II	Room 1
15:30 to 16:40	John Thomas University of Rochester Sunspots I	Room 1
16:40 to 17:05	Aaron Birch Forward modeling for local helioseismology	Room 1

Monday 13th September 2004
09:00 to 10:10	Goran Scharmer Fine structure of solar magnetic fields	Room 1
10:10 to 10:35	Fernando Moreno-Insertis Emergence of magnetic flux into the solar atmosphere: three dimensional experiments	Room 1
10:35 to 11:00	Nicholas Brummell University of Colorado What is a magnetic flux tube?	Room 1
11:25 to 12:35	John Thomas University of Rochester Sunspots II	Room 1
15:30 to 16:40	Fausto Cattaneo University of Chicago Small-scale dynamos I	Room 1
16:40 to 17:05	Alexander Kosovichev Stanford University Helioseismic observations of magnetohydrodynamics of the solar interior	Room 1

Tuesday 14th September 2004
09:00 to 10:10	Hendrik Spruit Magnetohydrodynamics of stably stratified stars	Room 1
10:10 to 10:35	Andrew Collier Cameron University of St Andrews Photospheric MHD simulations of solar pores	Room 1
10:35 to 11:00	Axel Brandenburg NORDITA Catastrophic alpha quenching alleviated by helicity flux and shear	Room 1
11:25 to 12:35	Fausto Cattaneo University of Chicago Small-scale dynamos II	Room 1
15:30 to 16:40	Michael Thompson Internal rotation of the Sun I: Results from helioseismology	Room 1
16:40 to 17:05	Nils Haugen NTNU Numerical simulations of small scale dynamo activity; spectra and critical magnetic Reynolds numbers	Room 1

Wednesday 15th September 2004
09:00 to 10:10	Michael Thompson Internal rotation of the Sun II	Room 1
10:10 to 10:35	Magnetic-field generation in low-magnetic-Prandtl-number plasmas	Room 1
10:35 to 11:00	Allan Sacha Brun Dynamo action in turbulent convective shells with or without rotation	Room 1
11:25 to 12:35	Steve Tobias University of Leeds Solar and stellar dynamos I	Room 1

Thursday 16th September 2004
09:00 to 10:10	Steve Tobias University of Leeds Solar and stellar dynamos II	Room 1
10:10 to 10:35	Alexander Ruzmaikin CALTECH (California Institute of Technology) Non-axisymmetric solar magnetic fields	Room 1
10:35 to 11:00	Keke Zhang University of Exeter Non-axisymmetric solar interface dynamos	Room 1
11:25 to 12:35	Stephen Fauve CNRS - Ecole Normale Superieure Paris Dynamo experiments I	Room 1
15:30 to 16:40	Gary Glatzmaier University of California Direct simulation of planetary and stellar dynamos I: methods and results	Room 1
16:40 to 17:05	Nonlinear dynamo action in rotating convection and shear	Room 1
17:05 to 18:15	Stephen Fauve CNRS - Ecole Normale Superieure Paris Dynamo experiments II	Room 1

Friday 17th September 2004
09:00 to 10:10	Gary Glatzmaier University of California Direct simulation of planetary and stellar dynamos II: future challenges	Room 1
10:10 to 10:35	Tamara Rogers University of California, Santa Cruz Numerical simulations of the solar tachocline	Room 1
10:35 to 11:00	Martin Schrinner Comparison of three-dimensional geodynamo calculations with mean-field models	Room 1

Speakers

Rainer Arlt
Aaron Birch
Axel Brandenburg NORDITA
Nicholas Brummell University of Colorado
Allan Sacha Brun
Paul Bushby University of Cambridge
Andrew Collier Cameron University of St Andrews
Fausto Cattaneo University of Chicago
Stephen Fauve CNRS - Ecole Normale Superieure Paris
Antonio Ferriz-Mas Universidad de Vigo
David Galloway University of Sydney
Gary Glatzmaier University of California
Douglas Gough University of Cambridge
Nils Haugen NTNU
Nathan Kleeorin
Alexander Kosovichev Stanford University
Fernando Moreno-Insertis
Aake Nordlund
Francois Rincon Observatoire Midi-Pyrenees
Igor Rogachevskii Ben-Gurion University
Tamara Rogers University of California, Santa Cruz
Robert Rosner University of Chicago
Alexander Ruzmaikin
Goran Scharmer
Martin Schrinner
Hendrik Spruit
Oskar Steiner
Reza Tavakol
John Thomas University of Rochester
Michael Thompson
Alan Title LMSAL
Steve Tobias University of Leeds
Alexander Voegler
Keke Zhang University of Exeter

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Magnetohydrodynamics of stellar interiors

Workshop theme

Timetable

Speakers

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