Formation mechanism of solar double-decker filament

https://phys.org/news/2022-07-formation-mechanism-solar-double-decker-filament.html

"two small filaments joined together to form a longer magnetic structure of the filament. Then, the newly formed filament split into two branches and finally formed a double-decker filament. Sunspot rotation, internal reconnections and the movement of the negative magnetic field were found to drive the filament split into two branches and finally form the double-decker filament. The internal reconnection can accelerate the separation of filaments"