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SUMMARY:Solar and Stellar Rotation - Current Developments in Wind Braking 
 - Adam Finley (Exeter)
DTSTART:20181029T140000Z
DTEND:20181029T150000Z
UID:TALK109591@talks.cam.ac.uk
CONTACT:Dr William Béthune
DESCRIPTION:The rotational evolution of low mass stars (<1.3 Solar Mass) i
 s governed by stellar winds which slow the stellar rotation during their m
 ain sequence lifetimes. The interaction of their global stellar magnetic f
 ield increases the effectiveness of this braking process. To model this\, 
 I compute a grid of MHD simulations with a range of stellar wind parameter
 s and magnetic topologies. Using this grid of models I fit semi-analytic r
 elationships capable of accounting for complex magnetic geometries\, which
  are generally applicable in rotational evolution calculations. To develop
  these models further\, I have taken advantage of the wealth of solar data
  available from in-situ and remote-sensing and applied the formulae to est
 imate the current solar wind braking. The Sun has a variable magnetic fiel
 d with times of high complexity and others of simple dipolar configuration
 . This variability is shown to effect the braking rate\, and with magnetic
  variability commonly observed in other Sun-like stars\, I also discuss th
 e implications for applying the formula to other Sun-like stars where the 
 magnetic variations are ill-constrained. Through the use of Zeeman-Doppler
  imaged stars I examine the effect of their magnetic variability and compa
 re these to the spin-evolution models.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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