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Article: Global Responses of the Coupled Thermosphere and Ionosphere System to the August 2017 Great American Solar Eclipse

TitleGlobal Responses of the Coupled Thermosphere and Ionosphere System to the August 2017 Great American Solar Eclipse
Authors
KeywordsElectrodynamic coupling
Ionosphere-thermosphere coupling
Solar eclipse
TIEGCM simulation
Traveling atmospheric disturbances
Issue Date2018
PublisherAmerican Geophysical Union. The Journal's web site is located at https://agupubs.onlinelibrary.wiley.com/journal/21562202a
Citation
Journal of Geophysical Research: Space Physics, 2018, v. 123 n. 8, p. 7040-7050 How to Cite?
AbstractIt is commonly believed that solar eclipses have a great impact on the ionosphere-thermosphere (I-T) system within the eclipse shadow, but little attention has been paid to the global response to these events. In this study, we investigate the global upper atmospheric responses to the recent Great American Solar Eclipse that occurred on 21 August 2017 using a high-resolution coupled ionosphere-thermosphere-electrodynamics model. The simulation results show that the ionosphere and thermosphere response to the eclipse is not just local but global. Large-scale traveling atmospheric disturbances (TADs), seen in the thermospheric temperature and winds, were triggered from the eclipse region and propagated in a southeast direction when the eclipse ended. A large total electron content (TEC) enhancement occurred over South America after the eclipse was over. The TEC enhancement was primarily the result of transport by the thermospheric wind perturbations associated with the eclipse-induced TADs. The perturbations of TEC, neutral temperature, and winds exhibited asymmetric distributions with respect to the totality path during the solar eclipse. Furthermore, ionospheric electrodynamic processes also play an important role in the global responses of the I-T system to the solar eclipse. Unlike the case of large-scale TADs propagating from the eclipse region to other locations in the globe, the ionospheric electric fields and plasma drifts began to show significant perturbations even during the local pre-eclipse period when local wind and temperature had not been perturbed. This is related to the instantaneous global response of the ionospheric current system to changes in the ionospheric conductivity and winds in the eclipse region.
Persistent Identifierhttp://hdl.handle.net/10722/260397
ISSN
2019 Impact Factor: 2.799
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorDang, T-
dc.contributor.authorLei, J-
dc.contributor.authorWang, Q-
dc.contributor.authorZhang, B-
dc.contributor.authorBurns, A-
dc.contributor.authorLe, H-
dc.contributor.authorWu, Q-
dc.contributor.authorRuan, H-
dc.date.accessioned2018-09-14T08:41:04Z-
dc.date.available2018-09-14T08:41:04Z-
dc.date.issued2018-
dc.identifier.citationJournal of Geophysical Research: Space Physics, 2018, v. 123 n. 8, p. 7040-7050-
dc.identifier.issn2169-9380-
dc.identifier.urihttp://hdl.handle.net/10722/260397-
dc.description.abstractIt is commonly believed that solar eclipses have a great impact on the ionosphere-thermosphere (I-T) system within the eclipse shadow, but little attention has been paid to the global response to these events. In this study, we investigate the global upper atmospheric responses to the recent Great American Solar Eclipse that occurred on 21 August 2017 using a high-resolution coupled ionosphere-thermosphere-electrodynamics model. The simulation results show that the ionosphere and thermosphere response to the eclipse is not just local but global. Large-scale traveling atmospheric disturbances (TADs), seen in the thermospheric temperature and winds, were triggered from the eclipse region and propagated in a southeast direction when the eclipse ended. A large total electron content (TEC) enhancement occurred over South America after the eclipse was over. The TEC enhancement was primarily the result of transport by the thermospheric wind perturbations associated with the eclipse-induced TADs. The perturbations of TEC, neutral temperature, and winds exhibited asymmetric distributions with respect to the totality path during the solar eclipse. Furthermore, ionospheric electrodynamic processes also play an important role in the global responses of the I-T system to the solar eclipse. Unlike the case of large-scale TADs propagating from the eclipse region to other locations in the globe, the ionospheric electric fields and plasma drifts began to show significant perturbations even during the local pre-eclipse period when local wind and temperature had not been perturbed. This is related to the instantaneous global response of the ionospheric current system to changes in the ionospheric conductivity and winds in the eclipse region.-
dc.languageeng-
dc.publisherAmerican Geophysical Union. The Journal's web site is located at https://agupubs.onlinelibrary.wiley.com/journal/21562202a-
dc.relation.ispartofJournal of Geophysical Research: Space Physics-
dc.rightsJournal of Geophysical Research: Space Physics. Copyright © American Geophysical Union.-
dc.rightsPublished version An edited version of this paper was published by AGU. Copyright (2018) American Geophysical Union.-
dc.subjectElectrodynamic coupling-
dc.subjectIonosphere-thermosphere coupling-
dc.subjectSolar eclipse-
dc.subjectTIEGCM simulation-
dc.subjectTraveling atmospheric disturbances-
dc.titleGlobal Responses of the Coupled Thermosphere and Ionosphere System to the August 2017 Great American Solar Eclipse-
dc.typeArticle-
dc.identifier.emailZhang, B: binzh@hku.hk-
dc.identifier.authorityZhang, B=rp02366-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1029/2018JA025566-
dc.identifier.scopuseid_2-s2.0-85052818732-
dc.identifier.hkuros290278-
dc.identifier.volume123-
dc.identifier.issue8-
dc.identifier.spage7040-
dc.identifier.epage7050-
dc.identifier.isiWOS:000445731300062-
dc.publisher.placeUnited States-
dc.identifier.issnl2169-9380-

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