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Title: RADYN Simulations of Non-thermal and Thermal Models of Ellerman Bombs

Abstract

Ellerman bombs (EBs) are brightenings in the H α 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 α line wings and continuum when the heating begins, while for the thermal models dimming occurs only in the H α 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, then the H α line will be unrealistically strong and there are still no clear UV burst signatures.

Authors:
;  [1];  [2]
  1. School of Astronomy and Space Science, Nanjing University, Nanjing 210023 (China)
  2. Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, NO-0315 Oslo (Norway)
Publication Date:
OSTI Identifier:
22663214
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 845; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ATMOSPHERES; BALMER LINES; CHROMOSPHERE; EVOLUTION; HEATING RATE; HYDRODYNAMICS; HYDROGEN; LIFETIME; MAGNETIC RECONNECTION; RADIANT HEAT TRANSFER; SIMULATION; SPECTRA; SUN

Citation Formats

Hong, Jie, Ding, M. D., and Carlsson, Mats, E-mail: dmd@nju.edu.cn. RADYN Simulations of Non-thermal and Thermal Models of Ellerman Bombs. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA80E3.
Hong, Jie, Ding, M. D., & Carlsson, Mats, E-mail: dmd@nju.edu.cn. RADYN Simulations of Non-thermal and Thermal Models of Ellerman Bombs. United States. doi:10.3847/1538-4357/AA80E3.
Hong, Jie, Ding, M. D., and Carlsson, Mats, E-mail: dmd@nju.edu.cn. Sun . "RADYN Simulations of Non-thermal and Thermal Models of Ellerman Bombs". United States. doi:10.3847/1538-4357/AA80E3.
@article{osti_22663214,
title = {RADYN Simulations of Non-thermal and Thermal Models of Ellerman Bombs},
author = {Hong, Jie and Ding, M. D. and Carlsson, Mats, E-mail: dmd@nju.edu.cn},
abstractNote = {Ellerman bombs (EBs) are brightenings in the H α 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 α line wings and continuum when the heating begins, while for the thermal models dimming occurs only in the H α 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, then the H α line will be unrealistically strong and there are still no clear UV burst signatures.},
doi = {10.3847/1538-4357/AA80E3},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 845,
place = {United States},
year = {2017},
month = {8}
}