Observational Study of Recurrent Jets: Evolution of Magnetic Flux, Current, and Helicity
We observed three recurrent blowout jets in an active region with the Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory. Using Helioseismic Magnetic Imager data we found that the magnetic flux of an emerging negative pole increases steadily before declining just as the jets er...
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| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad9b7d |
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| author | Chang Zhou Yang Guo Guoyin Chen Ye Qiu M.D. Ding |
| author_facet | Chang Zhou Yang Guo Guoyin Chen Ye Qiu M.D. Ding |
| author_sort | Chang Zhou |
| collection | DOAJ |
| description | We observed three recurrent blowout jets in an active region with the Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory. Using Helioseismic Magnetic Imager data we found that the magnetic flux of an emerging negative pole increases steadily before declining just as the jets erupt. Certain physical quantities, such as the total unsigned vertical current, align with the periodicity of the jets. The differential affine velocity of vector magnetograms reveals strong shear around the negative pole. The Doppler velocity map, calculated from the H α spectra observed by the Chinese H α Solar Explorer, shows upflows with large initial velocity before they can be observed by AIA. The magnetic field derived from the nonlinear force-free field (NLFFF) model suggests a topology akin to a fan–spine structure, consistent with AIA images. We calculated the evolution of the volumetric helicity ratio using the NLFFF model and found its phase aligns with the jet flux in AIA 171 Å. These results suggest that recurrent jets may be triggered by the accumulation and release of energy and helicity, driven by emergence, shearing, and cancellation of photospheric magnetic field. |
| format | Article |
| id | doaj-art-66c5b3e976b942f398bc87af94cd57b6 |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-66c5b3e976b942f398bc87af94cd57b62025-01-17T08:40:15ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0197916210.3847/1538-4357/ad9b7dObservational Study of Recurrent Jets: Evolution of Magnetic Flux, Current, and HelicityChang Zhou0https://orcid.org/0009-0009-1911-399XYang Guo1https://orcid.org/0000-0002-9293-8439Guoyin Chen2https://orcid.org/0000-0001-9610-0433Ye Qiu3https://orcid.org/0000-0002-1190-0173M.D. Ding4https://orcid.org/0000-0002-4978-4972School of Astronomy and Space Science and Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University , Nanjing 210023, People’s Republic of China ; guoyang@nju.edu.cnSchool of Astronomy and Space Science and Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University , Nanjing 210023, People’s Republic of China ; guoyang@nju.edu.cnSchool of Astronomy and Space Science and Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University , Nanjing 210023, People’s Republic of China ; guoyang@nju.edu.cnInstitute of Science and Technology for Deep Space Exploration, Suzhou Campus, Nanjing University , Suzhou 215163, People’s Republic of ChinaSchool of Astronomy and Space Science and Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University , Nanjing 210023, People’s Republic of China ; guoyang@nju.edu.cnWe observed three recurrent blowout jets in an active region with the Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory. Using Helioseismic Magnetic Imager data we found that the magnetic flux of an emerging negative pole increases steadily before declining just as the jets erupt. Certain physical quantities, such as the total unsigned vertical current, align with the periodicity of the jets. The differential affine velocity of vector magnetograms reveals strong shear around the negative pole. The Doppler velocity map, calculated from the H α spectra observed by the Chinese H α Solar Explorer, shows upflows with large initial velocity before they can be observed by AIA. The magnetic field derived from the nonlinear force-free field (NLFFF) model suggests a topology akin to a fan–spine structure, consistent with AIA images. We calculated the evolution of the volumetric helicity ratio using the NLFFF model and found its phase aligns with the jet flux in AIA 171 Å. These results suggest that recurrent jets may be triggered by the accumulation and release of energy and helicity, driven by emergence, shearing, and cancellation of photospheric magnetic field.https://doi.org/10.3847/1538-4357/ad9b7dSolar magnetic fieldsSolar magnetic flux emergenceSolar ultraviolet emissionSolar magnetic reconnection |
| spellingShingle | Chang Zhou Yang Guo Guoyin Chen Ye Qiu M.D. Ding Observational Study of Recurrent Jets: Evolution of Magnetic Flux, Current, and Helicity The Astrophysical Journal Solar magnetic fields Solar magnetic flux emergence Solar ultraviolet emission Solar magnetic reconnection |
| title | Observational Study of Recurrent Jets: Evolution of Magnetic Flux, Current, and Helicity |
| title_full | Observational Study of Recurrent Jets: Evolution of Magnetic Flux, Current, and Helicity |
| title_fullStr | Observational Study of Recurrent Jets: Evolution of Magnetic Flux, Current, and Helicity |
| title_full_unstemmed | Observational Study of Recurrent Jets: Evolution of Magnetic Flux, Current, and Helicity |
| title_short | Observational Study of Recurrent Jets: Evolution of Magnetic Flux, Current, and Helicity |
| title_sort | observational study of recurrent jets evolution of magnetic flux current and helicity |
| topic | Solar magnetic fields Solar magnetic flux emergence Solar ultraviolet emission Solar magnetic reconnection |
| url | https://doi.org/10.3847/1538-4357/ad9b7d |
| work_keys_str_mv | AT changzhou observationalstudyofrecurrentjetsevolutionofmagneticfluxcurrentandhelicity AT yangguo observationalstudyofrecurrentjetsevolutionofmagneticfluxcurrentandhelicity AT guoyinchen observationalstudyofrecurrentjetsevolutionofmagneticfluxcurrentandhelicity AT yeqiu observationalstudyofrecurrentjetsevolutionofmagneticfluxcurrentandhelicity AT mdding observationalstudyofrecurrentjetsevolutionofmagneticfluxcurrentandhelicity |