11:30 AM - 11:45 AM
[PEM11-08] Unveiling the Three-Dimensional Evolution of an Emerging Active Region with SUNRISE III/SCIP
Keywords:Sun, Magnetic field, Chromosphere, Spectropolarimetry
The magnetic field generated inside the Sun rises to the solar surface, forming active regions. Measuring the three-dimensional atmospheric parameters (temperature, velocity field, and magnetic field) during flux emergence is a key scientific challenge in studying the evolution of active regions. Enabled by continuous stable observations with space-borne telescopes, studies on photospheric magnetic fields in emerging regions have made significant progress. However, chromospheric magnetic field observations are currently limited to ground-based telescopes, making it extremely difficult to track the three-dimensional structure of emerging regions over long periods due to seeing effects. In July 2024, we successfully conducted continuous observations of an emerging active region for four hours using SCIP onboard the international balloon-borne observatory SUNRISE III. In this presentation, we will report on the initial analysis results of the multi-wavelength spectropolarimetric data.
SCIP continuously observed the emerging active region AR13753 from 10:05 to 14:12 UT on July 15, with a scanning frequency of 12 minutes per scan and a field of view of 58" x 58". As the flux emergence progressed, strong circular polarization signals appeared in the photosphere, showing a circular and linear polarization distribution suggestive of a serpentine magnetic field structure. In the chromosphere, we detected linear polarization signals connecting the two emerging magnetic poles. This result indicates that a large-scale horizontal magnetic field structure was formed at chromospheric heights due to flux emergence. Additionally, we have successfully captured brightening phenomena associated with the flux emergence. In the Ca II line (sensitive to the chromosphere), we observed wing brightening and the appearance of blue-shifted components, while in the Fe I line (sensitive to the photosphere), we detected a decrease in absorption. These observational results suggest the occurrence of magnetic reconnection in the lower atmospheric layers during flux emergence. We will also discuss the three-dimensional magnetic field and velocity field structures in the brightening regions.
SCIP continuously observed the emerging active region AR13753 from 10:05 to 14:12 UT on July 15, with a scanning frequency of 12 minutes per scan and a field of view of 58" x 58". As the flux emergence progressed, strong circular polarization signals appeared in the photosphere, showing a circular and linear polarization distribution suggestive of a serpentine magnetic field structure. In the chromosphere, we detected linear polarization signals connecting the two emerging magnetic poles. This result indicates that a large-scale horizontal magnetic field structure was formed at chromospheric heights due to flux emergence. Additionally, we have successfully captured brightening phenomena associated with the flux emergence. In the Ca II line (sensitive to the chromosphere), we observed wing brightening and the appearance of blue-shifted components, while in the Fe I line (sensitive to the photosphere), we detected a decrease in absorption. These observational results suggest the occurrence of magnetic reconnection in the lower atmospheric layers during flux emergence. We will also discuss the three-dimensional magnetic field and velocity field structures in the brightening regions.