The Formation and Eruption of A Sigmoidal Filament Driven by Rotating Network Magnetic Fields

Abstract

We present the formation and eruption of a sigmoidal filament driven by rotating network magnetic fields (RNFs) near the center of the solar disk, which was observed by the one-meter aperture New Vacuum Solar Telescope (NVST) at Fuxian Solar Observatory (FSO) on 2018 July 12. Counterclockwise RNFs twist two small-scale filaments at their northeastern foot-point region, giving a rotation of nearly 200 degree within about 140 minutes. The motion of the RNF has a tendency to accelerate at first and then decelerate obviously, as the average rotation speed increased from 10 to 150 ,and then slowed down to 50 . Coalescence then occurs between filaments F1 and F2. Meanwhile the fine structures in the southwestern region of the filament was involved in another interaction of coalescence. The subsequent EUV brightening due to plasma heating is observed in the two interaction regions. These interacting structures, including F1, F2 and the fine structures in the southwestern region, eventually evolve into a larger-scale sigmoidal filament twisted in the same direction as the RNFs gave. The twist of the sigmoidal filament has exceeded 4π and the filament erupted finally. The motion of the sigmoidal filament keeps uniform until a nearby jet collides, causing the filament to erupt faster. These results provide evidence that RNF plays an important role in the formation and eruption of the sigmoidal filament. The phenomena also suggests that the kink instability is the trigger mechanism for the filament eruption.

References in corpus (12)

• Confined and ejective eruptions of kink-unstable flux ropes
• Observation of kink instability during small B5.0 solar flare on 04 June, 2007
• Initiation of CME and Associated Flare Caused by Helical Kink Instability Observed by SDO/AIA
• A Time Series of Filament Eruptions Observed by Three Eyes from Space: From Failed to Successful Eruptions
• Direct Observations of Tether-cutting Reconnection During a Major Solar Event From 2014 February 24 to 25
• Initiation of Coronal Mass Ejections by Sunspot Rotation
• Ubiquitous rotating network magnetic fields and EUV cyclones in the quiet Sun
• Sunspot rotation, filament, and flare: The event on 2000 February 10
• Tether-cutting Reconnection between Two Solar Filaments Triggering Outflows and a Coronal Mass Ejection
• Formation of Compound Flux Rope by The Merging of Two Filament Channels, Associated Dynamics and its Stability
• Kink instability evidenced by analyzing the leg rotation of a filament
• A failed filament eruption inside a coronal mass ejection in active region 11121

Cited by in corpus (4)

• Oscillations and mass-draining that lead to a sympathetic eruption of a quiescent filament
• A partial filament eruption in three steps induced by external magnetic reconnection
• Nonlinear Fast Magnetosonic Waves in Solar Prominence Pillars
• Sunspot shearing and sudden retraction motion associated with the 2013 August 17 M3.3 Flare