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Title: IRIS Burst Spectra Co-spatial to a Quiet-Sun Ellerman-like Brightening

Abstract

Ellerman bombs (EBs) have been widely studied over the past two decades; however, only recently have the counterparts of these events been observed in the quiet-Sun. The aim of this article is to further understand small-scale quiet-Sun Ellerman-like brightenings (QSEBs) through research into their spectral signatures, including investigating whether the hot signatures associated with some EBs are also visible co-spatial to any QSEBs. We combine H α and Ca ii 8542 Å line scans at the solar limb with spectral and imaging data sampled by the Interface Region Imaging Spectrograph ( IRIS ). Twenty-one QSEBs were identified with average lifetimes, lengths, and widths measured to be around 120 s, 0.″63, and 0.″35, respectively. Three of these QSEBs displayed clear repetitive flaring through their lifetimes, comparable to the behavior of EBs in active regions. Two QSEBs in this sample occurred co-spatial to increased emission in SDO /AIA 1600 Å and IRIS slit-jaw imager 1400 Å data; however, these intensity increases were smaller than those reported co-spatially with EBs. One QSEB was also sampled by the IRIS slit during its lifetime, displaying increases in intensity in the Si iv 1393 Å and Si iv 1403 Å cores, as well as the Cmore » ii and Mg ii line wings, analogous to IRIS bursts (IBs). Using RADYN simulations, we are unable to reproduce the observed QSEB H α and Ca ii 8542 Å line profiles, leaving the question of the temperature stratification of QSEBs open. Our results imply that some QSEBs could be heated to transition region temperatures, suggesting that IB profiles should be observed throughout the quiet-Sun.« less

Authors:
;  [1]; ;  [2]; ;  [3]
  1. Solar Physics and Space Plasma Research Centre, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield, S3 7RH (United Kingdom)
  2. Departament de Física, Universitat de les Illes Balears, E-07122 Palma de Mallorca (Spain)
  3. Astrophysics Research Centre (ARC), School of Mathematics and Physics, Queens University, Belfast, BT7 1NN (United Kingdom)
Publication Date:
OSTI Identifier:
22663288
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 845; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CHROMOSPHERE; COMPARATIVE EVALUATIONS; EMISSION; INTERFACES; LIFETIME; MAGNETIC FIELDS; PHOTOSPHERE; SIMULATION; SPECTRA; STRATIFICATION; SUN

Citation Formats

Nelson, C. J., Erdélyi, R., Freij, N., Oliver, R., Reid, A., and Mathioudakis, M., E-mail: c.j.nelson@sheffield.ac.uk. IRIS Burst Spectra Co-spatial to a Quiet-Sun Ellerman-like Brightening. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA7E7A.
Nelson, C. J., Erdélyi, R., Freij, N., Oliver, R., Reid, A., & Mathioudakis, M., E-mail: c.j.nelson@sheffield.ac.uk. IRIS Burst Spectra Co-spatial to a Quiet-Sun Ellerman-like Brightening. United States. doi:10.3847/1538-4357/AA7E7A.
Nelson, C. J., Erdélyi, R., Freij, N., Oliver, R., Reid, A., and Mathioudakis, M., E-mail: c.j.nelson@sheffield.ac.uk. Thu . "IRIS Burst Spectra Co-spatial to a Quiet-Sun Ellerman-like Brightening". United States. doi:10.3847/1538-4357/AA7E7A.
@article{osti_22663288,
title = {IRIS Burst Spectra Co-spatial to a Quiet-Sun Ellerman-like Brightening},
author = {Nelson, C. J. and Erdélyi, R. and Freij, N. and Oliver, R. and Reid, A. and Mathioudakis, M., E-mail: c.j.nelson@sheffield.ac.uk},
abstractNote = {Ellerman bombs (EBs) have been widely studied over the past two decades; however, only recently have the counterparts of these events been observed in the quiet-Sun. The aim of this article is to further understand small-scale quiet-Sun Ellerman-like brightenings (QSEBs) through research into their spectral signatures, including investigating whether the hot signatures associated with some EBs are also visible co-spatial to any QSEBs. We combine H α and Ca ii 8542 Å line scans at the solar limb with spectral and imaging data sampled by the Interface Region Imaging Spectrograph ( IRIS ). Twenty-one QSEBs were identified with average lifetimes, lengths, and widths measured to be around 120 s, 0.″63, and 0.″35, respectively. Three of these QSEBs displayed clear repetitive flaring through their lifetimes, comparable to the behavior of EBs in active regions. Two QSEBs in this sample occurred co-spatial to increased emission in SDO /AIA 1600 Å and IRIS slit-jaw imager 1400 Å data; however, these intensity increases were smaller than those reported co-spatially with EBs. One QSEB was also sampled by the IRIS slit during its lifetime, displaying increases in intensity in the Si iv 1393 Å and Si iv 1403 Å cores, as well as the C ii and Mg ii line wings, analogous to IRIS bursts (IBs). Using RADYN simulations, we are unable to reproduce the observed QSEB H α and Ca ii 8542 Å line profiles, leaving the question of the temperature stratification of QSEBs open. Our results imply that some QSEBs could be heated to transition region temperatures, suggesting that IB profiles should be observed throughout the quiet-Sun.},
doi = {10.3847/1538-4357/AA7E7A},
journal = {Astrophysical Journal},
number = 1,
volume = 845,
place = {United States},
year = {Thu Aug 10 00:00:00 EDT 2017},
month = {Thu Aug 10 00:00:00 EDT 2017}
}