Material supply and magnetic configuration of an active region filament

Abstract

It is important to study the fine structures of solar filaments with high-resolution observations since it can help us understand the magnetic and thermal structures of the filaments and their dynamics. In this paper, we study a newly-formed filament located inside the active region NOAA 11762, which was observed by the 1.6 m New Solar Telescope (NST) at Big Bear Solar Observatory (BBSO) from 16:40:19 UT to 17:07:58 UT on 2013 June 5. As revealed by the H$\alpha$ filtergrams, cool material is seen to be injected into the filament spine with a speed of 5--10 km s${}^{-1}$. At the source of the injection, brightenings are identified in the chromosphere, which is accompanied by magnetic cancellation in the photosphere, implying the importance of magnetic reconnection in replenishing the filament with plasmas from the lower atmosphere. Counter-streamings are detected near one endpoint of the filament, with the plane-of-the-sky speed being 7--9 km s${}^{-1}$ in the H$\alpha$ red-wing filtergrams and 9--25 km s${}^{-1}$ in the blue-wing filtergrams. The observations are indicative of that this active region filament is supported by a sheared arcade without magnetic dips, and the counter-streamings are due to unidirectional flows with alternative directions, rather than due to the longitudinal oscillations of filament threads as in many other filaments.

20 pages, 8 figures, published by ApJ

References in corpus (6)

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• Preprocessing of vector magnetograph data for a non-linear force-free magnetic field reconstruction
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Cited by in corpus (11)

• Simulations of solar filament fine structures and their counterstreaming flows
• A unified model of solar prominence formation
• Filament Eruption and Its Reformation Caused by Emerging Magnetic Flux
• Extending Counter-Streaming Motion from an Active Region Filament to Sunspot Light Bridge
• Prominence fine structures in weakly twisted and highly twisted magnetic flux ropes
• Magnetic separatrix as the source region of the plasma supply for an active-region filament
• How eruptions of a small filament feed materials to a nearby larger-scaled filament
• Winking filaments due to cyclic evaporation-condensation
• Grow-up of a Filament Channel by Intermittent Small-scale Magnetic Reconnection
• Can Injection Model Replenish the Filaments in Weak Magnetic Environment?
• Formation and Characteristics of Filament Threads in Double-Dipped Magnetic Flux Tubes