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Article: Longitudinal Variations of Equatorial Ionospheric Electric Fields Near Sunrise

TitleLongitudinal Variations of Equatorial Ionospheric Electric Fields Near Sunrise
Authors
Keywordsgeomagnetic field effect
longitudinal difference
physical mechanisms
sunrise enhancement
zonal electric fields
Issue Date2021
Citation
Journal of Geophysical Research: Space Physics, 2021, v. 126, n. 5, article no. e2020JA028977 How to Cite?
AbstractIn this work, we carry out a comprehensive modeling study, using the Thermosphere–Ionosphere–Electrodynamics General Circulation Model, to explore the physical processes by which the longitude-dependent geomagnetic field drives the longitudinal variations of the sunrise enhancement of the zonal electric fields at the dip equator near the June solstice. Numerical experiments and diagnostic analyses of the electrodynamics equation show that the longitudinal differences of the equatorial zonal electric fields near sunrise are primarily associated with the longitudinal variations in the zonal wind dynamo, with those from the meridional wind dynamo contributing secondarily. Furthermore, the longitudinal differences of the wind dynamo near sunrise are mainly related to the longitudinal variations of (Formula presented.) and conductance, which are caused primarily by the direct influence of the longitudinal structures of magnetic field declination and strength. Meanwhile, the longitudinal variations of neutral winds, which also result in moderate (Formula presented.) longitudinal variations, play a secondary role in the longitudinal variations of the neutral wind dynamo, while plasma density, which has minor longitudinal differences near sunrise, contributes slightly by modifying the conductance. Overall, the sunrise enhancement in June is more significant at the longitudes where the magnetic field strength and distortion are larger or the magnetic field declination is smaller in the Northern Hemisphere.
Persistent Identifierhttp://hdl.handle.net/10722/341313
ISSN
2023 Impact Factor: 2.6
2023 SCImago Journal Rankings: 0.845
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChen, Junjie-
dc.contributor.authorWang, Wenbin-
dc.contributor.authorLei, Jiuhou-
dc.date.accessioned2024-03-13T08:41:50Z-
dc.date.available2024-03-13T08:41:50Z-
dc.date.issued2021-
dc.identifier.citationJournal of Geophysical Research: Space Physics, 2021, v. 126, n. 5, article no. e2020JA028977-
dc.identifier.issn2169-9380-
dc.identifier.urihttp://hdl.handle.net/10722/341313-
dc.description.abstractIn this work, we carry out a comprehensive modeling study, using the Thermosphere–Ionosphere–Electrodynamics General Circulation Model, to explore the physical processes by which the longitude-dependent geomagnetic field drives the longitudinal variations of the sunrise enhancement of the zonal electric fields at the dip equator near the June solstice. Numerical experiments and diagnostic analyses of the electrodynamics equation show that the longitudinal differences of the equatorial zonal electric fields near sunrise are primarily associated with the longitudinal variations in the zonal wind dynamo, with those from the meridional wind dynamo contributing secondarily. Furthermore, the longitudinal differences of the wind dynamo near sunrise are mainly related to the longitudinal variations of (Formula presented.) and conductance, which are caused primarily by the direct influence of the longitudinal structures of magnetic field declination and strength. Meanwhile, the longitudinal variations of neutral winds, which also result in moderate (Formula presented.) longitudinal variations, play a secondary role in the longitudinal variations of the neutral wind dynamo, while plasma density, which has minor longitudinal differences near sunrise, contributes slightly by modifying the conductance. Overall, the sunrise enhancement in June is more significant at the longitudes where the magnetic field strength and distortion are larger or the magnetic field declination is smaller in the Northern Hemisphere.-
dc.languageeng-
dc.relation.ispartofJournal of Geophysical Research: Space Physics-
dc.subjectgeomagnetic field effect-
dc.subjectlongitudinal difference-
dc.subjectphysical mechanisms-
dc.subjectsunrise enhancement-
dc.subjectzonal electric fields-
dc.titleLongitudinal Variations of Equatorial Ionospheric Electric Fields Near Sunrise-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1029/2020JA028977-
dc.identifier.scopuseid_2-s2.0-85107211614-
dc.identifier.volume126-
dc.identifier.issue5-
dc.identifier.spagearticle no. e2020JA028977-
dc.identifier.epagearticle no. e2020JA028977-
dc.identifier.eissn2169-9402-
dc.identifier.isiWOS:000657463000011-

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