# Günther Rüdiger / Manfred Küker (AIP)

The Cross Helicity at the Solar Surface by Simulations and Observations
Wann Am 17.04.2012 von 15:00 bis 16:00 Special Seminar SH, Hörsaal vCal / iCal

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.