Speaker
Description
Emerging flux regions (EFRs) are highly dynamic environments where magnetic fields rise through the solar atmosphere, often giving rise to arch filament systems (AFSs) and filamentary structures. We present high-resolution, multi-line observations of an EFR obtained during the Sunrise III mission, combining spectropolarimetric measurements from TuMag and SCIP with EUV observations from SDO. The dataset provides continuous temporal coverage over nearly four hours, allowing us to follow the evolution of plasma and magnetic fields across multiple atmospheric layers.
We find strong and highly variable plasma motions within the AFS, including both upflows and downflows, with line-of-sight downflow velocities derived from the Mg I b₂ line reaching up to ~17 km s⁻¹ at the footpoints. These high-velocity episodes are co-temporal with brightenings observed in AIA 171 Å and 304 Å channels. The multi-line inversions and magnetic field extrapolations reveal a complex and evolving magnetic topology, including regions where field lines from different domains converge.
The observed dynamics occurs in close temporal proximity to a partial filament eruption,
suggesting a possible relationship between the filament evolution and the AFS dynamics.
While the exact mechanism cannot be uniquely identified, the results point to a strong
coupling between plasma flows and changes in magnetic connectivity. This study highlights the diagnostic potential of high-resolution, multi-line observations for investigating the dynamics of emerging flux regions.