Speaker
Description
First Name: David Lykke
Last Name: Ivens
Affiliation: Max Planck Institute for Solar System Research
All Authors: David L. Ivens, Johann Hirzberger, Daniele Calchetti, Bernd Inhester, Sami K. Solanki
Abstract: The orbit of the ESA/NASA Solar Orbiter space mission allows for simultaneous observation of sunspots from different viewpoints. Combining data from the SO/PHI instrument with those obtained from Earth’s viewpoint can be used to study the properties of sunspots through stereoscopic means. In this project we combine line-of-sight Doppler velocities in the penumbra of a sunspot obtained by SO/PHI and SDO/HMI from two highly offset vantage points. We reconstruct the velocity vectors of the penumbral Evershed-flow under different assumptions including magnetic field data in the analysis. The temporal evolution of the Evershed-flow can then be studied with a time series of 6 hour duration and one minute cadence. Comparing the reconstructed velocity vector with the magnetic field vectors allows for a validation of the obtained results and gives new insights in the structure of sunspot penumbrae.