Statistical properties of Hα jets in the polar coronal hole and their implications in coronal activities
arXiv:2110.15543 · doi:10.1051/0004-6361/202141401
Abstract
Dynamic features, such as chromospheric jets, transition region network jets, coronal plumes and coronal jets, are abundant in the network regions of the solar polar coronal holes. We investigate the relationship between chromospheric jets and coronal activities (e.g., coronal plumes and jets).We analyze observations of a polar coronal hole including the filtergrams that were taken by the New Vacuum Solar Telescope (NVST) at the Hα-0.6 Åto study the Hα jets,and the Atmospheric Imaging Assembly (AIA) 171 Å images to follow the evolution of coronal activities. Hα jets are persistent in the network regions, only some regions (denoted as R1-R5) are rooted with discernible coronal plumes.With an automated method, we identify and track 1 320 Hα jets in the network regions. We find that the average lifetime, height and ascending speed of the Hα jets are 75.38 s, 2.67 Mm, 65.60 km s, respectively. The Hα jets rooted in R1-R5 are higher and faster than those in the others. We also find that propagating disturbances (PDs) in coronal plumes have a close connection with the Hα jets. The speeds of 28 out of 29 Hα jets associated with PDs are about 50 km s . In a case of coronal jet, we find that the speeds of both the coronal jet and the Hα jet are over 150 km s, suggesting that both cool and hot jets can be coupled together. Based on our analyses, it is evident that more dynamic Hα jets could release the energies to the corona, which might be the results of the development of Kelvin-Helmholtz instability (KHi) or small-scaled magnetic activities. We suggest that chromospheric jets, transition region network jets and ray-like features in the corona are coherent phenomena, and they are important tunnels for cycling energy and mass in the solar atmosphere.
13 pages,6 figures,accepted for publication in A&A
References in corpus (30)
- 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
- Dynamic Fibrils are driven by Magnetoacoustic Shocks
- High Resolution Observations and Modeling of Dynamic Fibrils
- On the generation of solar spicules and Alfvénic waves
- Nonlinear Instability of kink oscillations due to shear motions
- Generation of Solar Spicules and Subsequent Atmospheric Heating
- Search for high velocities in the disk counterpart of type II spicules
- Magnetoacoustic shocks as driver of quiet Sun mottles
- Observation of High-speed Outflow on Plume-like Structures of the Quiet Sun and Coronal Holes with SDO/AIA
- On a solar blowout jet: driven mechanism and the formation of cool and hot components
- Statistical properties of the Disk Counterparts of Type II Spicules from simultaneous observations of RBEs in Ca II 8542 and Hα
- Heating signatures in the disk counterparts of solar spicules in IRIS observations
- Evidence for polar jets as precursors of polar plume formation
- STEREO Observations of Quasi-Periodically Driven High Velocity Outflows in Polar Plumes
- Propagating intensity disturbances in polar corona as seen from AIA/SDO
- Explosive events in active region observed by IRIS and SST/CRISP
- The passband integrationproperties of Birefringent filter
- What causes the high apparent speeds in chromospheric and transition region spicules on the Sun?
- Characterising motion types of G-band bright points in the quiet Sun
- Wave heating in gravitationally stratified coronal loops in the presence of resistivity and viscosity
- Hα spectroscopy and multiwavelength imaging of a solar flare caused by filament eruption
- Measurements of Outflow Velocities in On-Disk Plumes from EIS Hinode Observations
- On the relation between transition region network jets and coronal plumes
- On the Parallel and Perpendicular Propagating Motions Visible in Polar Plumes: An Incubator For (Fast) Solar Wind Acceleration?
- Heating at the remote footpoints as a brake on jet flows along loops in the solar atmosphere
- Propagation of Waves above a Plage as Observed by IRIS and SDO
- How eruptions of a small filament feed materials to a nearby larger-scaled filament
- Population of Bright Plume Threads in Solar Polar Coronal Holes