Heating and Eruption of a Solar Circular Ribbon Flare
arXiv:2008.05020 · doi:10.3847/1538-4357/ab80c4
Abstract
We studied a circular-ribbon flare, SOL2014-12-17T04:51, with emphasis on its thermal evolution as determined by the Differential Emission Measure (DEM) inversion analysis of the extreme ultraviolet (EUV) images of the Atmospheric Imaging Assembly (AIA) instrument onboard the Solar Dynamics Observatory (SDO). Both temperature and emission measure start to rise much earlier than the flare, along with an eruption and formation of a hot halo over the fan structure. In the main flare phase, another set of ribbons forms inside the circular ribbon, and expands as expected for ribbons at the footpoints of a postflare arcade. An additional heating event further extends the decay phase, which is also characteristic of some eruptive flares. The basic magnetic configuration appears to be a fan-spine topology, rooted in a minority-polarity patch surrounded by majority-polarity flux. We suggest that reconnection at the null point begins well before the impulsive phase, when the null is distorted into a breakout current sheet, and that both flare and breakout reconnection are necessary in order to explain the subsequent local thermal evolution and the eruptive activities in this confined magnetic structure. Using local DEMs, we found a postflare temperature increase inside the fan surface, indicating that the so-called EUV late phase is due to continued heating in the flare loops.
arXiv comment13 pages, 8 figures, Accepted to ApJ
References in corpus (33)
- A Model for Solar Coronal Mass Ejections
- Small-scale filament eruptions as the driver of solar coronal hole X-ray jets
- Thermal Diagnostics with the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory: A Validated Method for Differential Emission Measure Inversions
- Eruption of a Kink-Unstable Filament in Active Region NOAA 10696
- Hot Spine Loops and the Nature of a Late-Phase Solar Flare
- Circular Ribbon Flares and Homologous Jets
- Fan-spine topology formation through two-step reconnection driven by twisted flux emergence
- A Breakout Model for Solar Coronal Jets with Filaments
- Current amplification and magnetic reconnection at a 3D null point. I - Physical characteristics
- On the nature of reconnection at a solar coronal null point above a separatrix dome
- Current sheet formation and non-ideal behaviour at three-dimensional magnetic null points
- Three-Dimensional Simulations of Tearing and Intermittency in Coronal Jets
- Magnetic Flux Cancelation as the Trigger of Solar Coronal-Hole Coronal Jets
- Magnetic reconnection between small-scale loops observed with the New Vacuum Solar Telescope
- X-ray and UV investigation into the magnetic connectivity of a solar flare
- A model for straight and helical solar jets: II. Parametric study of the plasma beta
- Evidence For The Magnetic Breakout Model in an Equatorial Coronal-Hole Jet
- Reconnection-Driven Coronal-Hole Jets with Gravity and Solar Wind
- First Detection of Plasmoids from Breakout Reconnection on the Sun
- Evidence for Solar Tether-cutting Magnetic Reconnection from Coronal Field Extrapolations
- Homologous Jet-Driven Coronal Mass Ejections From Solar Active Region 12192
- Simulations of Solar Jets Confined by Coronal Loops
- Flux rope, hyperbolic flux tube, and late EUV phases in a non-eruptive circular-ribbon flare
- Study of Two Successive Three-Ribbon Solar Flares on 2012 July 6
- Onset of the magnetic explosion in solar polar coronal X-ray jets
- Production of the Extreme-Ultraviolet Late Phase of an X Class Flare in a Three-Stage Magnetic Reconnection Process
- Multi-wavelength signatures of magnetic reconnection of a flare associated coronal mass ejection
- A Model for Energy Buildup and Eruption Onset in Coronal Mass Ejections
- How Can Active Region Plasma Escape into the Solar Wind from below a Closed Helmet Streamer?
- The Varying Light Curve and Timings of the Ultra-short Period Contact Binary KIC 9532219
- Investigating the driving mechanisms of coronal mass ejections
- Flow instabilities in solar jets in their upstream and downstream regimes
- Solar Eruption and Local Magnetic Parameters
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- Quasiperiodic Energy Release and Jets at the Base of Solar Coronal Plumes
- From Pseudostreamer Jets to CMEs: Observations of the Breakout Continuum
- Imaging and spectral study on the null point of a fan-spine structure during a solar flare
- Statistical analysis of circular-ribbon flares
- Microwave Study of a Solar Circular Ribbon Flare
- A coronal mass ejection encountered by four spacecraft within 1 au from the Sun: Ensemble modelling of propagation and magnetic structure
- Observational study of the formation of homologous confined circular-ribbon flares