IRIS observations of magnetic interactions in the solar atmosphere between pre-existing and emerging magnetic fields. I. Overall evolution
arXiv:1802.05657 · doi:10.3847/1538-4357/aab2a8
Abstract
We report multi-wavelength ultraviolet observations taken with the IRIS satellite, concerning the emergence phase in the upper chromosphere and transition region of an emerging flux region (EFR) embedded in the pre-existing field of active region NOAA 12529. IRIS data are complemented by full-disk observations of the Solar Dynamics Observatory satellite, relevant to the photosphere and the corona. The photospheric configuration of the EFR is also analyzed by measurements taken with the spectropolarimeter aboard the Hinode satellite, when the EFR was fully developed. Recurrent intense brightenings that resemble UV bursts, with counterparts in all coronal passbands, are identified at the edges of the EFR. Jet activity is also observed at chromospheric and coronal levels, near the observed brightenings. The analysis of the IRIS line profiles reveals the heating of dense plasma in the low solar atmosphere and the driving of bi-directional high-velocity flows with speed up to 100 km/s at the same locations. Compared with previous observations and numerical models, these signatures suggest evidence of several long-lasting, small-scale magnetic reconnection episodes between the emerging bipole and the ambient field. This process leads to the cancellation of a pre-existing photospheric flux concentration and appears to occur higher in the atmosphere than usually found in UV bursts, explaining the observed coronal counterparts.
arXiv comment12 figures, accepted in ApJ
References in corpus (60)
- The Interface Region Imaging Spectrograph (IRIS)
- The Solar Optical Telescope for the Hinode Mission: An Overview
- The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: Overview and Performance
- Solar Orbiter: Exploring the Sun-heliosphere connection
- Hot Explosions in the Cool Atmosphere of the Sun
- Simulation of the Formation of a Solar Active Region
- High precision density measurements in the solar corona: I. Analysis methods and results for Fe XII and Fe XIII
- Magnetic flux emergence in granular convection: Radiative MHD simulations and observational signatures
- Twisted flux tube emergence from the convection zone to the corona
- Fast magnetic reconnection in the solar chromosphere mediated by the plasmoid instability
- Ellerman bombs at high resolution III. Simultaneous observations with IRIS and SST
- Bombs and flares at the surface and lower atmosphere of the Sun
- Are IRIS bombs connected to Ellerman bombs?
- Multiwavelength Observations of Small-Scale Reconnection Events triggered by Magnetic Flux Emergence in the Solar Atmosphere
- The Formation of IRIS diagnostics. IV. The Mg II triplet lines as a new diagnostic for lower chromospheric heating
- The 2014 March 29 X-flare: sub-arcsecond resolution observations of Fe XXI 1354.1
- Iris si iv line profiles: An indication for the plasmoid instability during small-scale magnetic reconnection on the sun
- Intermittent reconnection and plasmoids in UV bursts in the low solar atmosphere
- The effect of the relative orientation between the coronal field and new emerging flux: I Global Properties
- A three-dimensional study of reconnection, current sheets and jets resulting from magnetic flux emergence in the Sun
- Heating mechanisms in the low solar atmosphere through magnetic reconnection in current sheets
- Returning magnetic flux in sunspot penumbrae
- The cool surge following flux emergence in a radiation-MHD experiment
- Emergence of granular-sized magnetic bubbles through the solar atmosphere: I. Spectropolarimetric observations and simulations
- Surges and Si IV bursts in the solar atmosphere. Understanding IRIS and SST observations through RMHD experiments
- Twisted flux tube emergence from the convection zone to the corona II: Later states
- Forward modeling of emission in SDO/AIA passbands from dynamic 3D simulations
- Compact solar UV burst triggered in a magnetic field with a fan-spine topology
- Density diagnostics derived from the OIV and SIV intercombination lines observed by IRIS
- Explosive events on sub-arcsecond scale in IRIS observations: a case study
- 3D MHD Flux Emergence Experiments: Idealized models and coronal interactions
- A magnetic reconnection event in the solar atmosphere driven by relaxation of a twisted arch filament system
- Explosive events in active region observed by IRIS and SST/CRISP
- Emergence of granular-sized magnetic bubbles through the solar atmosphere. II. Non-LTE chromospheric diagnostics and inversions
- IRIS and SDO observation of recurrent explosive events
- A low upper limit on the subsurface rise speed of solar active regions
- Various Local Heating Events in the Earliest Phase of Flux Emergence
- Evidence for a Transition Region response to penumbral microjets in sunspots
- The Formation of IRIS Diagnostics. VII. The Formation of the OI 135.56 nm Line in the Solar Atmosphere
- Cool transition region loops observed by the Interface Region Imaging Spectrograph
- Observational Evidence of Magnetic Reconnection for Brightenings and Transition Region Arcades in IRIS observations
- A Tale of Two Emergences: Sunrise II Observations of Emergence Sites in a Solar Active Region
- Granular-Scale Elementary Flux Emergence Episodes in a Solar Active Region
- HINODE Observations of Chromospheric Brightenings in the Ca II H Line during small-scale Flux Emergence Events
- Multi-wavelength Spectral Analysis of Ellerman Bombs Observed by FISS and IRIS
- The magnetic structure of surges in small-scale emerging flux regions
- SNR G349.7+0.2: A gamma-ray source in the far 3 kpc arm of the Galactic center
- Multi-Parametric Study of Rising 3D Buoyant Flux Tubes in an Adiabatic Stratification Using AMR
- Multi-wavelength high-resolution observations of a small-scale emerging magnetic flux event and the chromospheric and coronal response
- Observational Evidence of a Flux Rope within a Sunspot Umbra
- Dynamics of subarcsecond bright dots in the transition region above sunspot and their relation to penumbral micro-jets
- Emergence of granular-sized magnetic bubbles through the solar atmosphere. III. The path to the transition region
- Comparison between Hinode/SOT and SDO/HMI, AIA Data for the Study of the Solar Flare Trigger Process
- Multi-wavelength Study of Transition Region Penumbral Subarcsecond Bright Dots Using IRIS and NST
- Emergence of non-twisted magnetic fields in the Sun: Jets and atmospheric response
- Analysis of a spatially deconvolved solar pore
- 3D magnetic field configuration of small-scale reconnection events in the solar plasma atmosphere
- Evidence for two-loop interaction from IRIS and SDO observations of penumbral brightenings
- Atmospheric Response to of an Active Region to new Small Flux Emergence
- Undercover EUV Solar Jets Observed by the Interface Region Imaging Spectrograph
Cited by in corpus (25)
- The European Solar Telescope
- Ellerman bombs and UV bursts: reconnection at different atmospheric layers
- Extreme-ultraviolet bursts and nanoflares in the quiet-Sun transition region and corona
- An observationally-constrained model of strong magnetic reconnection in the solar chromosphere. Atmospheric stratification and estimates of heating rates
- IRIS observations of magnetic interactions in the solar atmosphere between pre-existing and emerging magnetic fields. II. UV emission properties
- Impulsive coronal heating from large-scale magnetic rearrangements: from IRIS to SDO/AIA
- Magnetic loops above a small flux-emerging region observed by IRIS, Hinode and SDO
- Multi-thermal jet formation triggered by flux emergence
- A model for heating the super-hot corona in solar active regions
- ALMA observations of transient heating in a solar active region
- Solar surges related to UV bursts: Characterization through k-means, inversions and density diagnostics
- Properties of the Umbral Filament Observed in Active Region NOAA 12529
- Emergence of small-scale magnetic flux in the quiet Sun
- Penumbral decay observed in active region NOAA 12585
- On the Magnetic Nature of an Exploding Granule as Revealed by Sunrise/IMaX
- Small-scale magnetic flux emergence preceding a chain of energetic solar atmospheric events
- Transition region loops in the very late phase of flux-emergence in IRIS sit-and-stare observations
- Chromospheric recurrent jets in a sunspot group and their inter-granular origin
- Penumbral brightening events observed in AR NOAA 12546
- Analysis of Pseudo-Lyapunov Exponents of Solar Convection Using State-of-the-Art Observations
- Global impact of emerging internetwork fields on the low solar atmosphere
- A new view of the solar interface region from the Interface Region Imaging Spectrograph (IRIS)
- Magnetic reconnection in partially ionized plasmas
- Emergence of internetwork magnetic fields through the solar atmosphere
- Observations of the formation of a proto-spot in a pre-existing field environment