A statistical comparison of EUV brightenings observed by SO/EUI with simulated brightenings in nonpotential simulations
MetadataShow full item record
The High Resolution Imager (HRIEUV) telescope of the Extreme Ultraviolet Imager (EUI) instrument onboard Solar Orbiter has observed EUV brightenings, so-called campfires, as fine-scale structures at coronal temperatures. The goal of this paper is to compare the basic geometrical (size, orientation) and physical (intensity, lifetime) properties of the EUV brightenings with regions of energy dissipation in a nonpotential coronal magnetic-field simulation. In the simulation, HMI line-of-sight magnetograms are used as input to drive the evolution of solar coronal magnetic fields and energy dissipation. We applied an automatic EUV-brightening detection method to EUV images obtained on 30 May 2020 by the HRIEUV telescope. We applied the same detection method to the simulated energy dissipation maps from the nonpotential simulation to detect simulated brightenings. We detected EUV brightenings with a density of 1.41×10−3 brightenings/Mm2 in the EUI observations and simulated brightenings between 2.76×10−2 – 4.14×10−2 brightenings/Mm2 in the simulation, for the same time range. Although significantly more brightenings were produced in the simulations, the results show similar distributions of the key geometrical and physical properties of the observed and simulated brightenings. We conclude that the nonpotential simulation can successfully reproduce statistically the characteristic properties of the EUV brightenings (typically with more than 85% similarity); only the duration of the events is significantly different between observations and simulation. Further investigations based on high-cadence and high-resolution magnetograms from Solar Orbiter are under consideration to improve the agreement between observation and simulation.
Barczynski , K , Meyer , K A , Harra , L K , Mackay , D H , Auchère , F & Berghmans , D 2022 , ' A statistical comparison of EUV brightenings observed by SO/EUI with simulated brightenings in nonpotential simulations ' , Solar Physics , vol. 297 , no. 10 , 141 . https://doi.org/10.1007/s11207-022-02074-6
Copyright © The Author(s) 2022. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
DescriptionFunding: Open access funding provided by Swiss Federal Institute of Technology Zurich. L.H. and K.B. are grateful to the SNF for the funding of the project number 200021_188390. D.H.M. would like to thank the STFC for support via consolidated grant ST/W001195/1. K.A.M. would like to thank the STFC for support via consortium grant ST/W001098/1.
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.