Günther Rüdiger / Manfred Küker (AIP)

The Cross Helicity at the Solar Surface by Simulations and Observations
When Apr 17, 2012 from 03:00 PM to 04:00 PM
  • Special Seminar
Where SH, Lecture hall
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In order to model the cross helicity at the solar surface, magnetoconvection under the presence of a vertical large-scale magnetic field is simulated with  NIRVANA. The robust result of the calculations is that the cross helicity can well be represented by the observable correlation of the vertical flow and the vertical field. The characteristic helicity speed as the ratio of the eddy diffusivity and the density scale height results to 1.1 km/s. This value coincides with the data of the Japanese HINODE satellite and the Swedish 1-m Solar Telescope. Both simulations and observations thus lead to 1012cm2/s as the sofar unknown eddy diffusivity at the surface of the  quiet Sun.