Observational Evidence of Magnetic Reconnection for Brightenings and Transition Region Arcades in IRIS observations

Abstract

By using a new method of forced-field extrapolation, we study the emerging flux region AR 11850 observed by the Interface Region Imaging Spectrograph (IRIS) and Solar Dynamical Observatory (SDO). Our results suggest that the bright points (BPs) in this emerging region have responses in lines formed from the upper photosphere to the transition region, with a relatively similar morphology. They have an oscillation of several minutes according to the Atmospheric Imaging Assembly (AIA) data at 1600 and 1700 A . The ratio between the BP intensities measured in 1600 A and 1700 A filtergrams reveals that these BPs are heated differently. Our analysis of the Helioseismic and Magnetic Imager (HMI) vector magnetic field and the corresponding topology in AR11850 indicates that the BPs are located at the polarity inversion line (PIL) and most of them related with magnetic reconnection or cancelation. The heating of the BPs might be different due to different magnetic topology. We find that the heating due to the magnetic cancelation would be stronger than the case of bald patch reconnection. The plasma density rather than the magnetic field strength could play a dominant role in this process. Based on physical conditions in the lower atmosphere, our forced-field extrapolation shows consistent results between the bright arcades visible in slit-jaw image (SJI) 1400 A and the extrapolated field lines that pass through the bald patches. It provides a reliable observational evidence for testing the mechanism of magnetic reconnection for the BPs and arcades in emerging flux region, as proposed in simulation works.

References in corpus (42)

• The Interface Region Imaging Spectrograph (IRIS)
• Hot Explosions in the Cool Atmosphere of the Sun
• Prevalence of Small-scale Jets from the Networks of the Solar Transition Region and Chromosphere
• Driving major solar flares and eruptions: a review
• From coronal observations to MHD simulations, the building blocks for 3D models of solar flares
• On the prevalence of small-scale twist in the solar chromosphere and transition region
• Fast magnetic reconnection in the solar chromosphere mediated by the plasmoid instability
• Ellerman bombs at high resolution III. Simultaneous observations with IRIS and SST
• Are IRIS bombs connected to Ellerman bombs?
• The Unresolved Fine Structure Resolved - IRIS observations of the Solar Transition Region
• Heating signatures in the disk counterparts of solar spicules in IRIS observations
• Recurrent Coronal Jets Induced by Repetitively Accumulated Electric Currents
• Heating mechanisms in the low solar atmosphere through magnetic reconnection in current sheets
• First Stereoscopic Coronal Loop Reconstructions from Stereo Secchi Images
• Imaging and Spectroscopic Diagnostics on the Formation of Two Magnetic Flux Ropes Revealed by SDO/AIA and IRIS
• Explosive events on sub-arcsecond scale in IRIS observations: a case study
• Observations of solar X-ray and EUV jets and their related phenomena
• Extreme Ultra-Violet Spectroscopy of the Lower Solar Atmosphere During Solar Flares
• Migration of Ca II H bright points in the internetwork
• SDO Observations of Magnetic Reconnection at Coronal Hole Boundaries
• Internetwork chromospheric bright grains observed with IRIS
• Numerical Simulation of Solar Microflares in a Canopy-Type Magnetic Configuration
• Forced field extrapolation of the magnetic structure of the Halpha fibrils in solar chromosphere
• Evidence of Explosive Evaporation in a Microflare Observed by Hinode/EIS
• On the Active Region Bright Grains Observed in the Transition Region Imaging Channels of IRIS
• First simultaneous SST/CRISP and IRIS observations of a small-scale quiet Sun vortex
• Magnetic flux supplement to coronal bright points
• Dynamics of Coronal Bright Points as seen by Sun Watcher using Active Pixel System detector and Image Processing (SWAP), Atmospheric Imaging Assembly AIA), and Helioseismic and Magnetic Imager (HMI)
• Properties and Modeling of Unresolved Fine Structure Loops Observed in the Solar Transition Region by IRIS
• Dispersal of G-band bright points at different longitudinal magnetic field strengths
• Evolution of microflares associated with bright points in coronal holes and in quiet regions
• Numerical Simulations of Chromospheric Microflares
• Numerical experiments on the detailed energy conversion and spectrum studies in a corona current sheet
• Bidirectional outflows as evidence of magnetic reconnection leading to a solar microflare
• Investigation of intergranular bright points from the New Vacuum Solar Telescope
• On the relationship between G-band bright point dynamics and their magnetic field strengths
• Reciprocatory magnetic reconnection in a coronal bright point
• Horizontal supergranule-scale motions inferred from TRACE ultraviolet observations of the chromosphere
• Subarcsecond Bright Points and Quasi-periodic Upflows Below a Quiescent Filament Observed by the IRIS
• Investigation of Umbral Dots with the New Vacuum Solar Telescope
• Relationship between EUV microflares and small-scale magnetic fields in the quiet Sun
• Statistical Study of Emerging Flux Regions and the Upper Atmosphere Response

Cited by in corpus (28)

• Solar ultraviolet bursts
• Frequently Occurring Reconnection Jets from Sunspot Light Bridges
• Magnetic reconnection at the earliest stage of solar flux emergence
• A magnetic reconnection event in the solar atmosphere driven by relaxation of a twisted arch filament system
• Magnetic reconnection in strongly magnetized regions of the low solar chromosphere
• Flame-like Ellerman Bombs and Their Connection to Solar UV Bursts
• IRIS observations of magnetic interactions in the solar atmosphere between pre-existing and emerging magnetic fields. I. Overall evolution
• A Magnetic Reconnection model for Hot Explosions in the Cool Atmosphere of the Sun
• IRIS observations of magnetic interactions in the solar atmosphere between pre-existing and emerging magnetic fields. II. UV emission properties
• A solar blowout jet caused by the eruption of a magnetic flux rope
• Spectroscopic and imaging observations of small-scale reconnection events
• Magnetic reconnection in the low solar chromosphere with a more realistic radiative cooling model
• Multi thermal atmosphere of a mini solar flare during magnetic reconnection observed with IRIS
• Solar Ultraviolet Bursts in a Coordinated Observation of IRIS, Hinode and SDO
• The role of small-scale surface motions in the transfer of twist to a solar jet from a remote stable flux rope
• Magnetic loops above a small flux-emerging region observed by IRIS, Hinode and SDO
• Formation of solar quiescent coronal loops through magnetic reconnection in an emerging active region
• Cancellation of Small-Scale Magnetic Features
• Transition-region explosive events produced by plasmoid instability
• Transition region loops in the very late phase of flux-emergence in IRIS sit-and-stare observations
• Non-equilibrium ionization by a periodic electron beam II. Synthetic Si IV and O IV transition region spectra
• The Ellerman bomb and Ultraviolet burst triggered successively by an emerging magnetic flux rope
• Magnetic Topology of quiet-Sun Ellerman bombs and associated Ultraviolet brightenings
• Toward a fast and consistent approach to model solar magnetic fields in multiple layers
• Magnetic field extrapolation in active region well comparable with observations in multiple layers
• Small-scale dynamic phenomena associated with interacting fan-spine topologies: quiet-Sun Ellerman bombs, UV brightenings, and chromospheric inverted-Y-shaped jets
• A new view of the solar interface region from the Interface Region Imaging Spectrograph (IRIS)
• Reminiscences