A Transient Coronal Sigmoid in Active Region NOAA 11909: Build-up Phase, M-class Eruptive Flare, and Associated Fast Coronal Mass Ejection

Abstract

In this article, we investigate the formation and disruption of a coronal sigmoid from the active region (AR) NOAA 11909 on 07 December 2013, by analyzing multi-wavelength and multi-instrument observations. Our analysis suggests that the formation of `transient' sigmoid initiated $\approx$1 hour before its eruption through a coupling between two twisted coronal loop systems. A comparison between coronal and photospheric images suggests that the coronal sigmoid was formed over a simple $\beta$-type AR which also possessed dispersed magnetic field structure in the photosphere. The line-of-sight photospheric magnetograms also reveal moving magnetic features, small-scale flux cancellation events near the PIL, and overall flux cancellation during the extended pre-eruption phase which suggest the role of tether-cutting reconnection toward the build-up of the flux rope. The disruption of the sigmoid proceeded with a two-ribbon eruptive M1.2 flare (SOL2013-12-07T07:29). In radio frequencies, we observe type III and type II bursts in meter wavelengths during the impulsive phase of the flare. The successful eruption of the flux rope leads to a fast coronal mass ejection (with a linear speed of $\approx$1085 km s -1 ) in SOHO/LASCO field-of-view. During the evolution of the flare, we clearly observe typical "sigmoid-to-arcade" transformation. Prior to the onset of the impulsive phase of the flare, flux rope undergoes a slow rise ($\approx$15 km s -1 ) which subsequently transitions into a fast eruption ($\approx$110 km s -1 ). The two-phase evolution of the flux rope shows temporal associations with the soft X-ray precursor and impulsive phase emissions of the M-class flare, respectively, thus pointing toward a feedback relationship between magnetic reconnection and early CME dynamics.

arXiv comment28 pages, 14 figures, accepted in Solar Physics Journal

References in corpus (30)

• A Review of Solar Type III Radio Bursts
• Observation of An Evolving Magnetic Flux Rope Prior To and During A Solar Eruption
• Flare-productive active regions
• Multi-scale Gaussian normalization for solar image processing
• Observing Flux Rope Formation During the Impulsive Phase of a Solar Eruption
• Photospheric flux cancellation and associated flux rope formation and eruption
• Direct Evidence for a Fast CME Driven by the Prior Formation and Subsequent Destabilization of a Magnetic Flux Rope
• CALLISTO - A new concept for solar radio
• The Driver of Coronal Mass Ejections in the Low Corona: A Flux Rope
• Formation of a Double-decker Magnetic Flux Rope in the Sigmoidal Solar Active Region 11520
• Height of Shock Formation in the Solar Corona Inferred from Observations of Type II Radio Bursts and Coronal Mass Ejections
• Flux Rope Formation Preceding Coronal Mass Ejection Onset
• How Common are Hot Magnetic Flux Ropes in the Low Solar Corona? A Statistical Study of EUV Observations
• Understanding the twist distribution inside magnetic flux ropes by anatomizing an interplanetary magnetic cloud
• Magnetic Reconnection During the Two-Phase Evolution of a Solar Eruptive Flare
• On-disc Observations of Flux Rope Formation Prior to its Eruption
• Successive flux rope eruptions from $\delta$-Sunspots region of NOAA 12673 and associated X-class eruptive flares on 2017 September 6
• Pre-flare activity and magnetic reconnection during the evolutionary stages of energy release in a solar eruptive flare
• Formation and eruption of a flux rope from the sigmoid active region NOAA 11719 and associated M6.5 flare: A multi-wavelength study
• On the role of repetitive magnetic reconnections in evolution of magnetic flux-ropes in solar corona
• Multi-wavelength signatures of magnetic reconnection of a flare associated coronal mass ejection
• Magnetic Flux and Helicity of Magnetic Clouds
• Pre-flare coronal jet and evolutionary phases of a solar eruptive prominence associated with M1.8 flare: SDO and RHESSI observations
• Pre-flare processes, flux rope activation, large-scale eruption and associated X-class flare from the active region NOAA 11875
• HXR emission from an activated flux rope and subsequent evolution of an eruptive long duration solar flare
• Eruptive-Impulsive Homologous M-class Flares Associated with Double-Decker Flux Rope Configuration in Mini-Sigmoid of NOAA 12673
• Identification of Pre-flare Processes and Their Possible Role in Driving a Large-scale Flux Rope Eruption with Complex M-class Flare in the Active Region NOAA 12371
• Impulsive energy release and non-thermal emission in a confined M4.0 flare triggered by rapidly evolving magnetic structures
• Observational and model analysis of a two-ribbon flare possibly induced by a neighbouring blowout jet
• Formation and eruption of sigmoidal structure from a weak field region of NOAA 11942

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