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Article: A Simulation Study on the Relationship Between Field-Aligned and Field-Perpendicular Plasma Velocities in the Ionospheric F Region

TitleA Simulation Study on the Relationship Between Field-Aligned and Field-Perpendicular Plasma Velocities in the Ionospheric F Region
Authors
Keywordsfield-aligned plasma velocity
ion drag
neutral wind dynamo
plasma drifts
Issue Date2020
Citation
Journal of Geophysical Research: Space Physics, 2020, v. 125, n. 1, article no. e2019JA027350 How to Cite?
AbstractThis study addresses a long-standing scientific puzzle regarding ionospheric F2 region dynamics. Incoherent scatter radar observations of F2 region plasma drifts showed a strong anticorrelation between temporal variations of field-aligned upward plasma velocity (Vi‖) and field-perpendicular poleward plasma drift (Vi ⊥ N) over time scales from a few hours to a day at middle latitudes. The underlying physical processes remain a highly controversial issue, despite a number of speculations and qualitative inspections. Previous studies lacked especially quantitative analysis that could lead to decisive conclusions. In this study, we provide a comprehensive modeling study to explore the physical processes relating Vi‖ with Vi ⊥ N variations using a self-consistent Thermosphere-Ionosphere-Electrodynamics General Circulation Model. It is found that the anticorrelation between Vi‖ and Vi ⊥ N has strong altitudinal and latitudinal dependences. The anticorrelation between the diurnal variations of Vi‖ and Vi ⊥ N is associated with the neutral wind dynamo. Poleward meridional winds result in downward Vi‖ and poleward Vi ⊥ N, and vice versa. The anticorrelation between short-term temporal disturbances of Vi‖ and Vi ⊥ N is mainly caused by ion drag, in response to high-latitude convection electric field forcing. This forcing penetrates to lower latitudes and affects poleward plasma drifts Vi ⊥ N, which drags poleward meridional winds and modulates downward Vi‖. As the enhanced convection electric fields subside, the anticorrelation is mainly associated with disturbance meridional wind dynamo. The storm time high-latitude energy and momentum inputs change global meridional winds which modify zonal electric fields to induce Vi ⊥ N changes. Furthermore, ambipolar diffusion plays a significant role in modulating the relationship between Vi‖ and Vi ⊥ N.
Persistent Identifierhttp://hdl.handle.net/10722/341267
ISSN
2023 Impact Factor: 2.6
2023 SCImago Journal Rankings: 0.845
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChen, Junjie-
dc.contributor.authorLei, Jiuhou-
dc.contributor.authorZhang, Shunrong-
dc.contributor.authorWang, Wenbing-
dc.contributor.authorDang, Tong-
dc.date.accessioned2024-03-13T08:41:28Z-
dc.date.available2024-03-13T08:41:28Z-
dc.date.issued2020-
dc.identifier.citationJournal of Geophysical Research: Space Physics, 2020, v. 125, n. 1, article no. e2019JA027350-
dc.identifier.issn2169-9380-
dc.identifier.urihttp://hdl.handle.net/10722/341267-
dc.description.abstractThis study addresses a long-standing scientific puzzle regarding ionospheric F2 region dynamics. Incoherent scatter radar observations of F2 region plasma drifts showed a strong anticorrelation between temporal variations of field-aligned upward plasma velocity (Vi‖) and field-perpendicular poleward plasma drift (Vi ⊥ N) over time scales from a few hours to a day at middle latitudes. The underlying physical processes remain a highly controversial issue, despite a number of speculations and qualitative inspections. Previous studies lacked especially quantitative analysis that could lead to decisive conclusions. In this study, we provide a comprehensive modeling study to explore the physical processes relating Vi‖ with Vi ⊥ N variations using a self-consistent Thermosphere-Ionosphere-Electrodynamics General Circulation Model. It is found that the anticorrelation between Vi‖ and Vi ⊥ N has strong altitudinal and latitudinal dependences. The anticorrelation between the diurnal variations of Vi‖ and Vi ⊥ N is associated with the neutral wind dynamo. Poleward meridional winds result in downward Vi‖ and poleward Vi ⊥ N, and vice versa. The anticorrelation between short-term temporal disturbances of Vi‖ and Vi ⊥ N is mainly caused by ion drag, in response to high-latitude convection electric field forcing. This forcing penetrates to lower latitudes and affects poleward plasma drifts Vi ⊥ N, which drags poleward meridional winds and modulates downward Vi‖. As the enhanced convection electric fields subside, the anticorrelation is mainly associated with disturbance meridional wind dynamo. The storm time high-latitude energy and momentum inputs change global meridional winds which modify zonal electric fields to induce Vi ⊥ N changes. Furthermore, ambipolar diffusion plays a significant role in modulating the relationship between Vi‖ and Vi ⊥ N.-
dc.languageeng-
dc.relation.ispartofJournal of Geophysical Research: Space Physics-
dc.subjectfield-aligned plasma velocity-
dc.subjection drag-
dc.subjectneutral wind dynamo-
dc.subjectplasma drifts-
dc.titleA Simulation Study on the Relationship Between Field-Aligned and Field-Perpendicular Plasma Velocities in the Ionospheric F Region-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1029/2019JA027350-
dc.identifier.scopuseid_2-s2.0-85081409945-
dc.identifier.volume125-
dc.identifier.issue1-
dc.identifier.spagearticle no. e2019JA027350-
dc.identifier.epagearticle no. e2019JA027350-
dc.identifier.eissn2169-9402-
dc.identifier.isiWOS:000535392400039-

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