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Article: Physical Processes Driving the Response of the F2 Region Ionosphere to the 21 August 2017 Solar Eclipse at Millstone Hill

TitlePhysical Processes Driving the Response of the F2 Region Ionosphere to the 21 August 2017 Solar Eclipse at Millstone Hill
Authors
Keywordseclipse effect
ionosphere response
wind changes
composition effect
Issue Date2019
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, 2019, v. 124 n. 4, p. 2978-2991 How to Cite?
AbstractThe high‐resolution thermosphere‐ionosphere‐electrodynamics general circulation model has been used to investigate the response of F2 region electron density (Ne) at Millstone Hill (42.61°N, 71.48°W, maximum obscuration: 63%) to the Great American Solar Eclipse on 21 August 2017. Diagnostic analysis of model results shows that eclipse‐induced disturbance winds cause F2 region Ne changes directly by transporting plasma along field lines, indirectly by producing enhanced O/N2 ratio that contribute to the recovery of the ionosphere at and below the F2 peak after the maximum obscuration. Ambipolar diffusion reacts to plasma pressure gradient changes and modifies Ne profiles. Wind transport and ambipolar diffusion take effect from the early phase of the eclipse and show strong temporal and altitude variations. The recovery of F2 region electron density above the F2 peak is dominated by the wind transport and ambipolar diffusion; both move the plasma to higher altitudes from below the F2 peak when more ions are produced in the lower F2 region after the eclipse. As the moon shadow enters, maximizes, and leaves a particular observation site, the disturbance winds at the site change direction and their effects on the F2 region electron densities also vary, from pushing plasma downward during the eclipse to transporting it upward into the topside ionosphere after the eclipse. Chemical processes involving dimming solar radiation and changing composition, wind transport, and ambipolar diffusion together cause the time delay and asymmetric characteristic (fast decrease of Ne and slow recovery of the eclipse effects) of the topside ionospheric response seen in Millstone Hill incoherent scatter radar observations.
Persistent Identifierhttp://hdl.handle.net/10722/274978
ISSN
2019 Impact Factor: 2.799
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, W-
dc.contributor.authorDang, T-
dc.contributor.authorLei, J-
dc.contributor.authorZhang, S-
dc.contributor.authorZhang, B-
dc.contributor.authorBurns, A-
dc.date.accessioned2019-09-10T02:32:51Z-
dc.date.available2019-09-10T02:32:51Z-
dc.date.issued2019-
dc.identifier.citationJournal of Geophysical Research: Space Physics, 2019, v. 124 n. 4, p. 2978-2991-
dc.identifier.issn2169-9380-
dc.identifier.urihttp://hdl.handle.net/10722/274978-
dc.description.abstractThe high‐resolution thermosphere‐ionosphere‐electrodynamics general circulation model has been used to investigate the response of F2 region electron density (Ne) at Millstone Hill (42.61°N, 71.48°W, maximum obscuration: 63%) to the Great American Solar Eclipse on 21 August 2017. Diagnostic analysis of model results shows that eclipse‐induced disturbance winds cause F2 region Ne changes directly by transporting plasma along field lines, indirectly by producing enhanced O/N2 ratio that contribute to the recovery of the ionosphere at and below the F2 peak after the maximum obscuration. Ambipolar diffusion reacts to plasma pressure gradient changes and modifies Ne profiles. Wind transport and ambipolar diffusion take effect from the early phase of the eclipse and show strong temporal and altitude variations. The recovery of F2 region electron density above the F2 peak is dominated by the wind transport and ambipolar diffusion; both move the plasma to higher altitudes from below the F2 peak when more ions are produced in the lower F2 region after the eclipse. As the moon shadow enters, maximizes, and leaves a particular observation site, the disturbance winds at the site change direction and their effects on the F2 region electron densities also vary, from pushing plasma downward during the eclipse to transporting it upward into the topside ionosphere after the eclipse. Chemical processes involving dimming solar radiation and changing composition, wind transport, and ambipolar diffusion together cause the time delay and asymmetric characteristic (fast decrease of Ne and slow recovery of the eclipse effects) of the topside ionospheric response seen in Millstone Hill incoherent scatter radar observations.-
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 Copyright [2019] American Geophysical Union. To view the published open abstract, go to https://doi.org/10.1029/2018JA025479-
dc.subjecteclipse effect-
dc.subjectionosphere response-
dc.subjectwind changes-
dc.subjectcomposition effect-
dc.titlePhysical Processes Driving the Response of the F2 Region Ionosphere to the 21 August 2017 Solar Eclipse at Millstone Hill-
dc.typeArticle-
dc.identifier.emailZhang, B: binzh@hku.hk-
dc.identifier.authorityZhang, B=rp02366-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1029/2018JA025479-
dc.identifier.scopuseid_2-s2.0-85063963304-
dc.identifier.hkuros304690-
dc.identifier.volume124-
dc.identifier.issue4-
dc.identifier.spage2978-
dc.identifier.epage2991-
dc.identifier.isiWOS:000477707800046-
dc.publisher.placeUnited States-
dc.identifier.issnl2169-9380-

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