A new view of the solar interface region from the Interface Region Imaging Spectrograph (IRIS)
arXiv:2103.16109 · doi:10.1007/s11207-021-01826-0
Abstract
The Interface Region Imaging Spectrograph (IRIS) has been obtaining near- and far-ultraviolet images and spectra of the solar atmosphere since July 2013. The unique combination of near and far-ultraviolet spectra and images at subarcsecond resolution and high cadence allows the tracing of mass and energy through the critical interface between the solar surface and the corona or solar wind. IRIS has enabled research into the fundamental physical processes thought to play a role in the low solar atmosphere such as ion-neutral interactions, magnetic reconnection, the generation, propagation, and dissipation of various types of waves, the acceleration of non-thermal particles, and various small-scale instabilities. These new findings have helped provide novel insights into a wide range of phenomena including the discovery of non-thermal particles in coronal nanoflares, the formation and impact of spicules and other jets, resonant absorption and dissipation of Alfvenic waves, energy release associated with braiding of magnetic field lines, the thermal instability in the chromosphere-corona mass and energy cycle, the contribution of waves, turbulence, and non-thermal particles in the energy deposition during flares and smaller-scale events such as UV bursts, and the role of flux ropes and other mechanisms in triggering CMEs. IRIS observations have also advanced studies of the connections between solar and stellar physics. Advances in numerical modeling, inversion codes, and machine learning techniques have played a key role in driving these new insights. With the advent of exciting new instrumentation both on the ground (e.g., DKIST, ALMA) and space-based (e.g., Parker Solar Probe, Solar Orbiter), we aim to review new insights based on IRIS observations or related modeling, and highlight some of the outstanding challenges that have been brought to the fore.
arXiv comment105 pages, 30 figures, accepted for publication in Solar Physics
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- Spectroscopic Diagnostics of Solar Magnetic Flux Ropes Using Iron Forbidden Line
- Quantifying the Influence of Key Physical Processes on the Formation of Emission Lines Observed by IRIS: I. Non-Equilibrium Ionization and Density-Dependent Rates
- Temporal and Spatial Scales in Coronal Rain Revealed by UV Imaging and Spectroscopic Observations
- 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
- Synthetic Emissions of the Fe XXI 1354 Å Line from Flare Loops Experiencing Fundamental Fast Sausage Oscillations
- Kelvin-Helmholtz instability and Alfvenic vortex shedding in solar eruptions
- Penumbral micro-jets at high spatial and temporal resolution
- What Is the Source of Quiet Sun Transition Region Emission?
- Chromospheric peculiar off-limb dynamical events from IRIS observations
- Continuum enhancements, line profiles and magnetic field evolution during consecutive flares
- The dark side of penumbral microjets: Observations in Hα
- Evolution Of Downflows In The Transition Region Above A Sunspot Over Short Time-Scales
- A multi-diagnostic spectral analysis of penumbral microjets
- Chromospheric UV bursts and turbulent driven magnetic reconnection
- A persistent quiet-Sun small-scale tornado. II. Oscillations
- Fine structure above a light bridge in the transition region and corona