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VERSION:2.0
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260511T121328Z
UID:https://www.mps.mpg.de/events/12973/7840830
DTSTART:20180222T100000Z
DTEND:20180222T110000Z
CLASS:PUBLIC
CREATED:20180216T120936Z
DESCRIPTION: The magnetic field in the Sun undergoes a cyclic modulation wi
 th a reversal typically every 11 years due to a dynamo operating under the
  surface. Also\, other solar-like stars exhibit magnetic activity\, most o
 f them with much higher levels compared to the Sun. Some of these stars sh
 ow cyclic modulation of their activity similar to the Sun. The rotational 
 dependence of activity and cycle length suggests a common underlying dynam
 o mechanism.Here we present results of 3D MHD convective dynamo simulation
 s of slowly and rapidly rotating solar-type stars\, where the interplay be
 tween convection and rotation self-consistently drives a large-scale magne
 tic field. With the help of the test-field method\, we are able to measure
  the turbulent transport coefficients in these simulations and therefore g
 et insights about the dynamo mechanism operating in these simulations. It 
 allows us to derive a scaling of the cycle period with the relevant effect
 s of the dynamo.We discuss how magnetic helicity is a key quantity connect
 ing the stellar convection zone with the stellar surface and stellar coron
 ae. Magnetic helicity is produced in the convection zone of stars via a dy
 namo in the presence of convection and rotation. At the surface\, it plays
  an important role in the formation process of active regions. In the coro
 na\, it is believed to be essential for the release of energy leading to t
 he eruption of plasma via coronal mass ejections and is thought to play an
  important role in the heating process of the coronal plasma. Numerical si
 mulations of stellar convection zones and the solar corona allow us to inv
 estigate this process.\nVortragende(r): Gregal Vissers 
LAST-MODIFIED:20260220T073750Z
LOCATION:Max-Planck-Institut für Sonnensystemforschung\, Raum: Auditorium
ORGANIZER;CN=Andreas Lagg:mailto:
SUMMARY:ESPOS: ESP Online Seminar: What can numerical simulations tell us a
 bout the mechanism of solar and stellar activity? (J. Warnecke) 
URL;VALUE=URI:https://www.mps.mpg.de/events/12973/7840830
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