Transient small-scale brightenings in the quiet solar corona: A model for campfires observed with Solar Orbiter. Chen, Y., Przybylski, D., Peter, H., Tian, H., Auchère, F., & Berghmans, D. Astronomy & Astrophysics, 656:L7, December, 2021. ![Transient small-scale brightenings in the quiet solar corona: A model for campfires observed with Solar Orbiter [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Methods. We used the MURaM code to solve the 3D radiation magnetohydrodynamic equations in a box that stretches from the upper convection zone to the corona. The model self-consistently produces a supergranular network of the magnetic field and a hot corona above this quiet Sun. For the comparison with the model, we synthesized the coronal emission as seen by EUI in its 174 Å channel, isolated the seven strongest transient brightenings, and investigated the changes of the magnetic field in and around these in detail. Results. The transients we isolated have a lifetime of about 2 min and are elongated loop-like features with lengths around 1 Mm to 4 Mm. They tend to occur at heights of about 2 Mm to 5 Mm above the photosphere, a bit offset from magnetic concentrations that mark the bright chromospheric network, and they reach temperatures of above 1 MK. As a result, they very much resemble the larger campfires found in observations. In our model most events are energized by component reconnection between bundles of field lines that interact at coronal heights. In one case, we find that untwisting a highly twisted flux rope initiates the heating. Conclusions. Based on our study, we propose that the majority of campfire events found by EUI are driven by component reconnection and our model suggests that this process significantly contributes to the heating of the corona above the quiet Sun.
@article{chen_transient_2021,
title = {Transient small-scale brightenings in the quiet solar corona: {A} model for campfires observed with {Solar} {Orbiter}},
volume = {656},
issn = {0004-6361, 1432-0746},
shorttitle = {Transient small-scale brightenings in the quiet solar corona},
url = {https://www.aanda.org/10.1051/0004-6361/202140638},
doi = {10.1051/0004-6361/202140638},
abstract = {Methods. We used the MURaM code to solve the 3D radiation magnetohydrodynamic equations in a box that stretches from the upper convection zone to the corona. The model self-consistently produces a supergranular network of the magnetic field and a hot corona above this quiet Sun. For the comparison with the model, we synthesized the coronal emission as seen by EUI in its 174 Å channel, isolated the seven strongest transient brightenings, and investigated the changes of the magnetic field in and around these in detail.
Results. The transients we isolated have a lifetime of about 2 min and are elongated loop-like features with lengths around 1 Mm to 4 Mm. They tend to occur at heights of about 2 Mm to 5 Mm above the photosphere, a bit offset from magnetic concentrations that mark the bright chromospheric network, and they reach temperatures of above 1 MK. As a result, they very much resemble the larger campfires found in observations. In our model most events are energized by component reconnection between bundles of field lines that interact at coronal heights. In one case, we find that untwisting a highly twisted flux rope initiates the heating.
Conclusions. Based on our study, we propose that the majority of campfire events found by EUI are driven by component reconnection and our model suggests that this process significantly contributes to the heating of the corona above the quiet Sun.},
language = {en},
urldate = {2022-07-12},
journal = {Astronomy \& Astrophysics},
author = {Chen, Yajie and Przybylski, Damien and Peter, Hardi and Tian, Hui and Auchère, F. and Berghmans, D.},
month = dec,
year = {2021},
pages = {L7},
}
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For the comparison with the model, we synthesized the coronal emission as seen by EUI in its 174 Å channel, isolated the seven strongest transient brightenings, and investigated the changes of the magnetic field in and around these in detail. Results. The transients we isolated have a lifetime of about 2 min and are elongated loop-like features with lengths around 1 Mm to 4 Mm. They tend to occur at heights of about 2 Mm to 5 Mm above the photosphere, a bit offset from magnetic concentrations that mark the bright chromospheric network, and they reach temperatures of above 1 MK. As a result, they very much resemble the larger campfires found in observations. In our model most events are energized by component reconnection between bundles of field lines that interact at coronal heights. In one case, we find that untwisting a highly twisted flux rope initiates the heating. Conclusions. Based on our study, we propose that the majority of campfire events found by EUI are driven by component reconnection and our model suggests that this process significantly contributes to the heating of the corona above the quiet Sun.","language":"en","urldate":"2022-07-12","journal":"Astronomy & Astrophysics","author":[{"propositions":[],"lastnames":["Chen"],"firstnames":["Yajie"],"suffixes":[]},{"propositions":[],"lastnames":["Przybylski"],"firstnames":["Damien"],"suffixes":[]},{"propositions":[],"lastnames":["Peter"],"firstnames":["Hardi"],"suffixes":[]},{"propositions":[],"lastnames":["Tian"],"firstnames":["Hui"],"suffixes":[]},{"propositions":[],"lastnames":["Auchère"],"firstnames":["F."],"suffixes":[]},{"propositions":[],"lastnames":["Berghmans"],"firstnames":["D."],"suffixes":[]}],"month":"December","year":"2021","pages":"L7","bibtex":"@article{chen_transient_2021,\n\ttitle = {Transient small-scale brightenings in the quiet solar corona: {A} model for campfires observed with {Solar} {Orbiter}},\n\tvolume = {656},\n\tissn = {0004-6361, 1432-0746},\n\tshorttitle = {Transient small-scale brightenings in the quiet solar corona},\n\turl = {https://www.aanda.org/10.1051/0004-6361/202140638},\n\tdoi = {10.1051/0004-6361/202140638},\n\tabstract = {Methods. We used the MURaM code to solve the 3D radiation magnetohydrodynamic equations in a box that stretches from the upper convection zone to the corona. The model self-consistently produces a supergranular network of the magnetic field and a hot corona above this quiet Sun. For the comparison with the model, we synthesized the coronal emission as seen by EUI in its 174 Å channel, isolated the seven strongest transient brightenings, and investigated the changes of the magnetic field in and around these in detail.\nResults. The transients we isolated have a lifetime of about 2 min and are elongated loop-like features with lengths around 1 Mm to 4 Mm. They tend to occur at heights of about 2 Mm to 5 Mm above the photosphere, a bit offset from magnetic concentrations that mark the bright chromospheric network, and they reach temperatures of above 1 MK. As a result, they very much resemble the larger campfires found in observations. In our model most events are energized by component reconnection between bundles of field lines that interact at coronal heights. In one case, we find that untwisting a highly twisted flux rope initiates the heating.\nConclusions. Based on our study, we propose that the majority of campfire events found by EUI are driven by component reconnection and our model suggests that this process significantly contributes to the heating of the corona above the quiet Sun.},\n\tlanguage = {en},\n\turldate = {2022-07-12},\n\tjournal = {Astronomy \\& Astrophysics},\n\tauthor = {Chen, Yajie and Przybylski, Damien and Peter, Hardi and Tian, Hui and Auchère, F. and Berghmans, D.},\n\tmonth = dec,\n\tyear = {2021},\n\tpages = {L7},\n}\n\n","author_short":["Chen, Y.","Przybylski, D.","Peter, H.","Tian, H.","Auchère, F.","Berghmans, D."],"key":"chen_transient_2021","id":"chen_transient_2021","bibbaseid":"chen-przybylski-peter-tian-auchre-berghmans-transientsmallscalebrighteningsinthequietsolarcoronaamodelforcampfiresobservedwithsolarorbiter-2021","role":"author","urls":{"Paper":"https://www.aanda.org/10.1051/0004-6361/202140638"},"metadata":{"authorlinks":{}},"html":""},"bibtype":"article","biburl":"https://bibbase.org/zotero/lloydwoodham","dataSources":["KswDSEBpD9sHPxkz4"],"keywords":[],"search_terms":["transient","small","scale","brightenings","quiet","solar","corona","model","campfires","observed","solar","orbiter","chen","przybylski","peter","tian","auchère","berghmans"],"title":"Transient small-scale brightenings in the quiet solar corona: A model for campfires observed with Solar Orbiter","year":2021}