Tuesday, September 9, 2025

Chromospheric H-alpha surge as observed by GONG


On 9 September 2025, GONG/Learmonth station captured H-alpha  surge (H-alpha jet) in a close proximity to the main sunspot of active region 14207. H-alpha jets appear as eruptions along narrow collimated path. The surges are accompanied by micro-flares at its base, followed by the eruption of a dark material. Some surges show rotational motions. The surges are modeled as a reconnection events between the opened magnetic fields and closed magnetic fields of emerging regions (see below for magnetic field configuration by Yuandeng Shen (2021, doi: 10.1098/rspa.2020.0217)).  Small-scale solar jets play an important role in supplying material and energy to the solar wind. Larger jet may contribute to space weather.

 

 

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