The dynamics of AR 12700 in its early emerging phase II: fan-shaped activities relevant to arch filament systems
arXiv:1907.10345 · doi:10.3847/1538-4357/ab345c
Abstract
The emergence of active regions (ARs) closely relates to the solar dynamo and the dynamical atmospheric phenomena.With high-resolution and long-lasting observations from the New Vacuum Solar Telescope, we report a new dynamic activity phenomenon named "fan-shaped activity (FSA)" in the emerging phase of NOAA AR 12700. The FSAs are clearly observed at Ha wavelength and are closely related to the dynamics of the adjacent arch filament system (AFS), including threads deformation and materials downward motions. On 2018 February 26, the two most representative FSAs appeared around 05:21 UT and 06:03 UT, respectively, and they firstly ascended and then decayed in around 10 minutes. At the ascending phase, accompanied by the uplifting of an adjacent AFS, each FSA launches up at one end of the AFS and extends for up to 11 Mm. At the decaying phase, the FSA gradually vanishes, and materials downflows towards the other end of the AFS are detected. After checking the evolution of the magnetic fields of AR 12700, we find that each FSA is located between the end of an AFS and an adjacent magnetic patch with the same polarity and launches at the onset of the collision and compression between these two magnetic patches. We propose that the collision lifts up the AFS, and then the initially compact AFS laterally expands, resulting in the formation of FSA. A cartoon model is proposed to depict the activities.
arXiv comment19 pages, 7 figures, Accpeted to ApJ
References in corpus (39)
- The Interface Region Imaging Spectrograph (IRIS)
- The Solar Optical Telescope for the Hinode Mission: An Overview
- Optimization code with weighting function for the reconstruction of coronal magnetic fields
- Chromospheric Anemone Jets as Evidence of Ubiquitous Reconnection
- Preprocessing of vector magnetograph data for a non-linear force-free magnetic field reconstruction
- Simulation of the Formation of a Solar Active Region
- Giant Chromospheric Anemone Jet Observed with Hinode and Comparison with Magnetohydrodynamic Simulations: Evidence of Propagating Alfven Waves and Magnetic Reconnection
- How to optimize nonlinear force-free coronal magnetic field extrapolations from SDO/HMI vector magnetograms?
- Numerical simulations of active region scale flux emergence: From spot formation to decay
- Interaction between a fast rotating sunspot and ephemeral regions as the origin of the major solar event on 2006 December 13
- Multiwavelength Observations of Small-Scale Reconnection Events triggered by Magnetic Flux Emergence in the Solar Atmosphere
- Formation of Magnetic Flux Ropes during Confined Flaring Well Before the Onset of a Pair of Major Coronal Mass Ejections
- Frequently Occurring Reconnection Jets from Sunspot Light Bridges
- The Origin of Major Solar Activity - Collisional Shearing Between Nonconjugated Polarities of Multiple Bipoles Emerging Within Active Regions
- The effect of the relative orientation between the coronal field and new emerging flux: I Global Properties
- Eruption of a multi-flux-rope system in solar active region 12673 leading to the two largest flares in Solar Cycle 24
- Light Bridge in a Developing Active Region. I. Observation of Light Bridge and its Dynamic Activity Phenomena
- Emergence of magnetic flux generated in a solar convective dynamo. I: Formation of Sunspots and Active regions, and Origin of Their Asymmetries
- Fan-shaped jets above the light bridge of a sunspot driven by reconnection
- Surges and Si IV bursts in the solar atmosphere. Understanding IRIS and SST observations through RMHD experiments
- Detection of opposite polarities in a sunspot light bridge: evidence of low-altitude magnetic reconnection
- Small-scale chromospheric jets above a sunspot light bridge
- Observations of Multiple Surges Associated with Magnetic Activities in AR10484 on 25 October 2003
- Various Local Heating Events in the Earliest Phase of Flux Emergence
- Numerical Simulation of Solar Microflares in a Canopy-Type Magnetic Configuration
- A Tale of Two Emergences: Sunrise II Observations of Emergence Sites in a Solar Active Region
- The eruption of a small-scale emerging flux rope as the driver of an M-class flare and a coronal mass ejection
- Statistical Study on the Nature of Solar Flux Emergence
- Granular-Scale Elementary Flux Emergence Episodes in a Solar Active Region
- High-Resolution Observations of Flares in an Arch Filament System
- Small-scale magnetic flux emergence in the quiet Sun
- Temporal evolution of arch filaments as seen in He I 10830 Å
- Multi-wavelength high-resolution observations of a small-scale emerging magnetic flux event and the chromospheric and coronal response
- On Signatures of Twisted Magnetic Flux Tube Emergence
- Multiwavelength Observations of a Flux Rope Formation by Series of Magnetic Reconnection in the Chromosphere
- Fan-shaped jets in three dimensional reconnection simulation as a model of ubiquitous solar jets
- Spectropolarimetric observations of an arch filament system with the GREGOR solar telescope
- High-resolution imaging spectroscopy of two micro-pores and an arch filament system in a small emerging-flux region
- The dynamics of AR 12700 in its early emerging phase I: interchange reconnection