Formation and Characteristics of Filament Threads in Double-Dipped Magnetic Flux Tubes
arXiv:2107.12181 · doi:10.3847/1538-4357/ac17e8
Abstract
As one of the main formation mechanisms of solar filament formation, the chromospheric evaporation-coronal condensation model has been confirmed by numerical simulations to explain the formation of filament threads very well in flux tubes with single dips. However, coronal magnetic extrapolations indicated that some magnetic field lines might possess more than one dip. It is expected that the formation process would be significantly different in this case compared to a single-dipped magnetic flux tube. In this paper, based on the evaporation-condensation model, we study filament thread formation in double-dipped magnetic flux tubes by numerical simulations. We find that only with particular combinations of magnetic configuration and heating, e.g., concentrated localized heating and a long magnetic flux tube with deep dips, can two threads form and persist in a double-dipped magnetic flux tube. Comparing our parametric survey with observations, we conclude that such magnetically connected threads due to multiple dips are more likely to exist in quiescent filaments than in active-region filaments. Moreover, we find that these threads are usually shorter than independently trapped threads, which might be one of the reasons why quiescent filaments have short threads. These characteristics of magnetically connected threads could also explain barbs and vertical threads in quiescent filaments.
arXiv comment43 pages, 13 figures, 4 tables. Accepted for publication in ApJ
References in corpus (38)
- Physics of Solar Prominences: II - Magnetic Structure and Dynamics
- Physics of Solar Prominences: I - Spectral Diagnostics and Non-LTE Modelling
- Key Aspects of Coronal Heating
- MPI-AMRVAC 2.0 for Solar and Astrophysical Applications
- The Dynamic Formation of Prominence Condensations
- Emergence of a Helical Flux Rope Under an Active Region Prominence
- Formation and evolution of a multi-threaded prominence
- Formation and plasma circulation of solar prominences
- Simulations of Prominence Formation in the Magnetized Solar Corona by Chromospheric Heating
- Formation of Solar Filaments by Steady and Nonsteady Chromospheric Heating
- Imaging and Spectroscopic Observations of a Filament Channel and the Implications for the Nature of Counter-streamings
- Chirality and Magnetic Configurations of Solar Filaments
- Simulating the in situ condensation process of solar prominences
- Observations and Magnetic Field Modeling of a Solar Polar Crown Prominence
- Can Thermal Nonequilibrium Explain Coronal Loops?
- On the Magnetic Field Strength of Active Region Filaments
- Some interesting topics provoked by the solar filament research in the past decade
- Helicity Condensation as the Origin of Coronal and Solar Wind Structure
- Magnetic Structure and Dynamics of the Erupting Solar Polar Crown Prominence on 2012 March 12
- Open questions on prominences from coordinated observations by IRIS, Hinode, SDO/AIA, THEMIS, and the Meudon/MSDP
- Parametric survey of longitudinal prominence oscillation simulations
- Simulations of solar filament fine structures and their counterstreaming flows
- Regularized Biot-Savart Laws for Modeling Magnetic Flux Ropes
- 3D Prominence-hosting Magnetic Configurations: Creating a Helical Magnetic Flux Rope
- Statistical Analysis of Filament Features Based on the Hα Solar Images from 1988 to 2013 by Computer Automated Detection Method
- The Distinction Between Thermal Nonequilibrium and Thermal Instability
- Large-amplitude longitudinal oscillations in a solar filament
- Solar Filament Longitudinal Oscillations along a Magnetic Field Tube with Two Dips
- Dependence of the Length of Solar Filament Threads on the Magnetic Configuration
- Formation and material supply of an active-region filament associated with newly emerging flux
- A unified model of solar prominence formation
- Material supply and magnetic configuration of an active region filament
- Longitudinal filament oscillations enhanced by two C-class flares
- Magnetic separatrix as the source region of the plasma supply for an active-region filament
- Two Types of Long-duration Quasi-static Evolution of Solar Filaments
- Observationally quantified reconnection providing a viable mechanism for active region coronal heating
- Does a solar filament barb always correspond to a prominence foot?
- One dimensional prominence threads: I. Equilibrium models