RADYN simulations of non-thermal and thermal models of Ellerman bombs

Abstract

Ellerman bombs (EBs) are brightenings in the H$\alpha$ line wings that are believed to be caused by magnetic reconnection in the lower atmosphere. To study the response and evolution of the chromospheric line profiles, we perform radiative hydrodynamic simulations of EBs using both non-thermal and thermal models. Overall, these models can generate line profiles that are similar to observations. However, in non-thermal models we find dimming in the H$\alpha$ line wings and continuum when the heating begins, while for the thermal models dimming occurs only in the H$\alpha$ line core, and with a longer lifetime. This difference in line profiles can be used to determine whether an EB is dominated by non-thermal heating or thermal heating. In our simulations, if a higher heating rate is applied, the H$\alpha$ line will be unrealistically strong, while there are still no clear UV burst signatures.

20 pages, 9 figures, accepted for publication in ApJ

References in corpus (12)

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• Radiative Hydrodynamic Models of Optical and Ultraviolet Emission from M Dwarf Flares
• Heating mechanisms in the low solar atmosphere through magnetic reconnection in current sheets
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• Small-Scale Structuring Of Ellerman Bombs at Solar Limb
• Observations and NLTE modeling of Ellerman bombs
• Observations of Ellerman bomb emission features in He I D3 and He I 10830 Å
• Ellerman Bombs with Jets: Cause and Effect
• Solar Flare Chromospheric Line Emission: Comparison Between IBIS High-resolution Observations and Radiative Hydrodynamic Simulations
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Cited by in corpus (12)

• Ellerman bombs and UV bursts: reconnection at different atmospheric layers
• Flame-like Ellerman Bombs and Their Connection to Solar UV Bursts
• Dissecting bombs and bursts: non-LTE inversions of low-atmosphere reconnection in SST and IRIS observations
• Transition region adaptive conduction (TRAC) in multidimensional magnetohydrodynamic simulations
• The Atmospheric Response to High Nonthermal Electron Beam Fluxes in Solar Flares. II. Hydrogen Broadening Predictions for Solar Flare Observations with the Daniel K. Inouye Solar Telescope
• The Response of the Lyman-Alpha Line in Different Flare Heating Models
• Occurrence and Statistics of IRIS Bursts
• The Ellerman bomb and Ultraviolet burst triggered successively by an emerging magnetic flux rope
• Radiative Hydrodynamic Simulations of the Spectral Characteristics of Solar White-light Flares
• Non-LTE Calculations of the Mg I 12.32 $\mu$m Line in a Flaring Atmosphere
• IRIS burst properties in active regions
• Revisiting the Spectral Features of Ellerman Bombs and UV Bursts. I. Radiative Hydrodynamic Simulations