Göttingen 2025 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 4: Sun and Heliosphere II

EP 4.5: Vortrag

Dienstag, 1. April 2025, 15:00–15:15, ZHG101

Unveiling the dynamics and thermal structures of the jet base from SO high-resolution observation — •Xiaohong Li — Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany

Solar jets, characterized by small-scale plasma ejections along open magnetic field lines or the limbs of large-scale coronal loops, play a crucial role in the dynamics of the solar atmosphere. Solar Orbiter (SO) enables us to investigate the structure of solar jets with much higher spatial and temporal resolutions and from different angles. Using the EUI/HRI data, we observed firework-like structures, which are the dynamic manifestations of the jet base. This bright structure is located above the magnetic neutral line, the region where reconnection occurs. Numerous flows spread out from the reconnection point to the surrounding area at speeds exceeding 100 km/s. By analyzing the evolution of the magnetograms from PHI/HRT, we identified a clear flux cancellation process at the footpoint of the jet. Testing different extrapolation methods, including potential field, nonlinear force-free field, and magnetohydrostatic field, we find the jets display fan-spine structures. The base flows are confined within the fan structure, with the highest flow speed near the null point. Additionally, the temperature peaks near the null-point, proving that persistent magnetic reconnection drives the recurrent jets. These high-resolution observations provide new insights into the complex dynamics and thermal structures at the base of solar jets, advancing our understanding of their formation and contribution to solar atmospheric phenomena.

Keywords: solar atmosphere; solar magnetism; extrapolation