Meso-scale photospheric convection during chromospheric fan-shaped surge on light bridge
Recently, intermittent and aperiodic fan-shaped chromospheric surges have attracted significant attention, though their related photospheric dynamic signals remain unclear. This study examines seven such surges and their potential photospheric signals along a light bridge (LB) in NOAA AR 12371 over a period of 100 min using BBSO/GST observations. Each surge displays as dark, jet-like structures with nearly uniform amplitudes, aligned closely along the LB to form a long smooth upper edge. Simultaneously, the photospheric LB exhibits dynamic grains, including bright points and granules. Adjacent grains brighten, expand, and merge into a ‘grain group’ (GG), which span LB’s cross-section. As GG moves along the LB, its leading edge develops an arched structure. During GG formation, the local horizontal magnetic field direction undergoes significant deflection. Within the 100-min interval, 10 GGs were recorded, occurring intermittently and aperiodically. Notably, three photospheric GG-free intervals corresponded to three chromospheric surge-free intervals, with a temporal delay (80–712 s) between GG reappearance and surge recurrence. Our findings suggest that meso-scale photospheric GGs, larger than individual granules but smaller than the full extent of the LB, are closely related to chromospheric surges. A conceptual model integrating inverse turbulent cascades and flux tube interactions is proposed, unifying multi-scale energy transfer from photospheric convection to chromospheric reconnection.
Authors
- Wenda Cao (ORCID: https://orcid.org/0000-0003-2427-6047)
- Reizaburo Kitai
- Chunlan Jin (ORCID: https://orcid.org/0000-0003-4763-0854)
- Shuhong Yang (ORCID: https://orcid.org/0000-0002-6565-3251)
- Xiaoshuai Zhu (ORCID: https://orcid.org/0000-0002-1682-1714)
- Qiao Song (ORCID: https://orcid.org/0000-0003-3568-445X)
- Baolin Tan (ORCID: https://orcid.org/0000-0003-2047-9664)
- Suo Liu (ORCID: https://orcid.org/0000-0002-1396-7603)
- Yuzong Zhang (ORCID: https://orcid.org/0000-0002-2869-0651)
- Xinjie Mao
- Kaifan Ji (ORCID: https://orcid.org/0000-0001-8950-3875)
- Ding Yuan (ORCID: https://orcid.org/0000-0002-9514-6402)
- Jiangtao Su (ORCID: https://orcid.org/0000-0002-5152-7318)
- Jun Zhang (ORCID: https://orcid.org/0000-0001-7835-9871)
- Yunfei Yang
- X. T. Huang (ORCID: https://orcid.org/0000-0003-1734-1664)
Institutions
- Kunming University of Science and Technology (CN)
- New Jersey Institute of Technology (US)
- Ritsumeikan University (JP)
- China Meteorological Administration (CN)
- Anhui University (CN)
- Chinese Academy of Sciences (CN)
- Harbin Institute of Technology (CN)
- Beijing Normal University (CN)
- Yunnan Observatories (CN)
- China National Space Administration (CN)
- National Space Science Center (CN)
- Chinese Academy of Meteorological Sciences (CN)
- Beijing Meteorological Bureau (CN)
- Astronomy and Space (AU)
- National Astronomical Observatories (CN)
Publication Details
- Journal
- Discover Applied Sciences
- Published
- 2025-04-23
- DOI
- https://doi.org/10.1007/s42452-025-06873-x
- Primary Topic
- Solar and Space Plasma Dynamics
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Science Foundation
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Seoul National University
- Korea Astronomy and Space Science Institute
- Japan Society for the Promotion of Science
- Youth Innovation Promotion Association