Can the temperature of Ellerman Bombs be more than 10000K?

Abstract

Ellerman bombs (EBs) are small brightening events in the solar lower atmosphere. By original definition, the main EB's characteristic is the two emission bumps in both wings of chromospheric lines, such as H$\alpha$ and Ca II 8542 Å lines. Up to now, most authors found that the temperature increase of EBs around the temperature minimum region is in the range of 600K-3000K. However, with recent IRIS observations, some authors proposed that the temperature increase of EBs could be more than 10000K. Using non-LTE semi-empirical modeling, we investigate the line profiles, continuum emission and the radiative losses for the EB models with different temperature increases, and compare them with observations. Our result indicates that if the EB maximum temperature attains more than 10000K around the temperature minimum region, then the resulted H$\alpha$ and Ca II 8542 Å line profiles and the continuum emission would be much stronger than that of EB observations. Moreover, due to the high radiative losses, the high temperature EB would have a very short lifetime, which is not comparable with the observations. Thus, our study does not support the proposal that the EB temperatures are higher than 10000K.

7 pages, 4 figure, accepted for publication in RAA

References in corpus (5)

• Hot Explosions in the Cool Atmosphere of the Sun
• Heating mechanisms in the low solar atmosphere through magnetic reconnection in current sheets
• Spectral observations of Ellerman bombs and fitting with a two-cloud model
• Small-Scale Structuring Of Ellerman Bombs at Solar Limb
• Observations and NLTE modeling of Ellerman bombs

Cited by in corpus (13)

• Solar ultraviolet bursts
• Frequently Occurring Reconnection Jets from Sunspot Light Bridges
• Ellerman bombs and UV bursts: transient events in chromospheric current sheets
• Magnetic reconnection at the earliest stage of solar flux emergence
• Magnetic reconnection in strongly magnetized regions of the low solar chromosphere
• 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
• A Magnetic Reconnection model for Hot Explosions in the Cool Atmosphere of the Sun
• RADYN simulations of non-thermal and thermal models of Ellerman bombs
• Solar Ultraviolet Bursts in a Coordinated Observation of IRIS, Hinode and SDO
• Evaluation of different recipes for chromospheric radiative losses in solar flares
• Automatic detection of Ellerman bombs in the H$\alpha$ line
• Revisiting the Spectral Features of Ellerman Bombs and UV Bursts. I. Radiative Hydrodynamic Simulations