Observational signatures of a kink-unstable coronal flux rope using Hinode/EIS
arXiv:1705.05114 · doi:10.3847/1538-4357/aa6d0e
Abstract
The signatures of energy release and energy transport for a kink-unstable coronal flux rope are investigated via forward modelling. Synthetic intensity and Doppler maps are generated from a 3D numerical simulation. The CHIANTI database is used to compute intensities for three Hinode/EIS emission lines that cover the thermal range of the loop. The intensities and Doppler velocities at simulation resolution are spatially degraded to the Hinode/EIS pixel size (1\arcsec), convolved using a Gaussian point-spread function (3\arcsec), and exposed for a characteristic time of 50 seconds. The synthetic images generated for rasters (moving slit) and sit-and-stare (stationary slit) are analysed to find the signatures of the twisted flux and the associated instability. We find that there are several qualities of a kink-unstable coronal flux rope that can be detected observationally using Hinode/EIS, namely the growth of the loop radius, the increase in intensity towards the radial edge of the loop, and the Doppler velocity following an internal twisted magnetic field line. However, EIS cannot resolve the small, transient features present in the simulation, such as sites of small-scale reconnection (e.g. nanoflares)
References in corpus (19)
- CHIANTI - An atomic database for Emission Lines. Version 8
- A Contemporary View of Coronal Heating
- Eruption of a Kink-Unstable Filament in Active Region NOAA 10696
- Observation of kink instability during small B5.0 solar flare on 04 June, 2007
- Constant cross section of loops in the solar corona
- 3D MHD modeling of twisted coronal loops
- Forward Modelling of Standing Kink Modes in Coronal Loops II. Applications
- Effect of collisions and magnetic convergence on electron acceleration and transport in reconnecting twisted solar flare loops
- An overview of flux braiding experiments
- Thermal and non-thermal emission from reconnecting twisted coronal loops
- Forward Modelling of Propagating Slow Waves in Coronal Loops and Their Frequency-Dependent Damping
- Observational Signatures of Waves and Flows in the Solar Corona
- Soft X-ray emission in kink-unstable coronal loops
- The Evolution of Writhe in Kink-Unstable Flux Ropes and Erupting Filaments
- Chromospheric seismology above sunspot umbrae
- Plasma motions and non-thermal line broadening in flaring twisted coronal loops
- Observational signatures of the coronal kink instability with thermal conduction
- Temporal variations of X-ray solar flare loops: length, corpulence, position, temperature, plasma pressure and spectra
- Simulation of the Observed Coronal Kink Instability and Its Implications for the SDO/AIA
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- Predictions of DKIST/DL-NIRSP observations for an off-limb kink-unstable coronal loop
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- Can Multi-Threaded Flux Tubes in Coronal Arcades Support a Magnetohydrodynamic Avalanche?