Coronal microjets in quiet-Sun regions observed with the Extreme Ultraviolet Imager onboard Solar Orbiter
arXiv:2108.08718 · doi:10.3847/2041-8213/ac1f30
Abstract
We report the smallest coronal jets ever observed in the quiet Sun with recent high resolution observations from the High Resolution Telescopes (HRI-EUV and HRI-Lyα) of the Extreme Ultraviolet Imager (EUI) onboard Solar Orbiter. In the HRI-EUV (174 Å) images, these microjets usually appear as nearly collimated structures with brightenings at their footpoints. Their average lifetime, projected speed, width, and maximum length are 4.6 min, 62 km s^(-1), 1.0 Mm, and 7.7 Mm, respectively. Inverted-Y shaped structures and moving blobs can be identified in some events. A subset of these events also reveal signatures in the HRI-Lyα (H I Lyα at 1216 Å) images and the extreme ultraviolet images taken by the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory. Our differential emission measure analysis suggests a multi-thermal nature and an average density of ~1.4x10^9 cm^(-3) for these microjets. Their thermal and kinetic energies were estimated to be ~3.9x10^24 erg and ~2.9x10^23 erg, respectively, which are of the same order of the released energy predicted by the nanoflare theory. Most events appear to be located at the edges of network lanes and magnetic flux concentrations, suggesting that these coronal microjets are likely generated by magnetic reconnection between small-scale magnetic loops and the adjacent network field.
Accepted by ApJL, 19 pages, 6 figures, and 2 tables
References in corpus (32)
- The Solar Orbiter mission -- Science overview
- Chromospheric Anemone Jets as Evidence of Ubiquitous Reconnection
- Solar Coronal Jets: Observations, Theory, and Modeling
- Small-scale filament eruptions as the driver of solar coronal hole X-ray jets
- Prevalence of Small-scale Jets from the Networks of the Solar Transition Region and Chromosphere
- Thermal Diagnostics with the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory: A Validated Method for Differential Emission Measure Inversions
- Generation of Solar Spicules and Subsequent Atmospheric Heating
- Magnetic Flux Cancellation as the Trigger of Solar Quiet-Region Coronal Jets
- Observation and Modeling of Solar Jets
- Blobs in recurring EUV jets
- Three-Dimensional Simulations of Tearing and Intermittency in Coronal Jets
- Observations of Subarcsecond Bright Dots in the Transition Region above Sunspots with the Interface Region Imaging Spectrograph
- Heating signatures in the disk counterparts of solar spicules in IRIS observations
- A model for straight and helical solar jets: II. Parametric study of the plasma beta
- Multiwavelength Study of Equatorial Coronal-Hole Jets
- Reconnection-Driven Coronal-Hole Jets with Gravity and Solar Wind
- Fine-scale explosive energy release at sites of prospective magnetic flux cancellation in the core of the solar active region observed by Hi-C 2.1, IRIS and SDO
- Explosive events on sub-arcsecond scale in IRIS observations: a case study
- Hi-C 2.1 Observations of Jetlet-like Events at Edges of Solar Magnetic Network Lane
- Explosive events in active region observed by IRIS and SST/CRISP
- Plasma Heating Induced by Tadpole-Like Downflows in the Flaring Solar Corona
- Successive Two-sided loop Jets Caused by Magnetic Reconnection between Two adjacent Filamentary Threads
- Evolution of the Toroidal Flux of CME Flux Ropes during Eruption
- Investigating the Transition Region Explosive Events and Their Relationship to Network Jets
- Thermodynamical Evolution of Supra-Arcade Downflows
- Coronal Mini-jets in an Activated Solar Tornado-like Prominence
- On the relation between transition region network jets and coronal plumes
- The Bi-directional Moving Structures in a Coronal Bright Point
- How eruptions of a small filament feed materials to a nearby larger-scaled filament
- Sunspot penumbral filaments intruding into a light bridge and the resultant reconnection jets
- On the Observation and Simulation of Solar Coronal Twin Jets
- Observational Study on the Fine Structure and Dynamics of a Solar Jet. I. Energy Build-Up Process around a Satellite Spot
Cited by in corpus (5)
- Moving structures in ultraviolet bright points: observations from Solar Orbiter/EUI
- Characteristics of Chromospheric Oscillation Periods in Magnetic Bright Points (MBPs)
- Quasi-periodic microjets driven by granular advection as observed with high-resolution imaging at He I 10830 Å
- Various Activities above Sunspot Light Bridges in IRIS Observations: Classification and Comparison
- SolO/EUI Observations of Ubiquitous Fine-scale Bright Dots in an Emerging Flux Region: Comparison with a Bifrost MHD Simulation