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dc.contributor.authorMann, Ingrid
dc.contributor.authorHäggström, I.
dc.contributor.authorTjulin, A
dc.contributor.authorRostami, S
dc.contributor.authorAnyairo, CC
dc.contributor.authorDalin, P
dc.date.accessioned2017-08-07T14:00:58Z
dc.date.available2017-08-07T14:00:58Z
dc.date.issued2016-11-05
dc.description.abstractThe Polar Summer Mesosphere has the lowest temperatures that occur in the entire Earth system. Water ice particles below the optically observable size range participate there in the formation of strong radar echoes (Polar Mesospheric Summer Echoes, PMSE). To study PMSE we carried out observations with the European Incoherent Scatter (EISCAT) VHF and EISCAT UHF radar simultaneously from a site near Tromsø (69.58°N, 19.2272°E) and observed VHF backscattering also with the EISCAT receivers in Kiruna (67.86°N, 20.44°E) and Sodankylä (67.36°N, 26.63°E). This is one of the first tristatic measurements with EISCAT VHF, and we therefore describe the observations and geometry in detail. We present observations made on 26 June 2013 from 7:00 to 13:00 h UT where we found similar PMSE patterns with all three VHF receivers and found signs of wind shear in PMSE. The observations suggest that the PMSE contains sublayers that move in different directions horizontally, and this points to Kelvin-Helmholtz instability possibly playing a role in PMSE formation. We find no signs of PMSE in the UHF data. The electron densities that we derive from observed incoherent scatter at UHF are at PMSE altitudes close to the noise level but possibly indicate reduced electron densities directly above the PMSE.en_US
dc.description(c) American Geophysical Union, reprinted with permission. Article also available at source: <a href=https://doi.org/10.1002/2016JA023080>https://doi.org/10.1002/2016JA023080</a>en
dc.identifier.citationMann IB, Häggström I, Tjulin, Rostami, Anyairo, Dalin. First wind shear observation in PMSE with the tristatic EISCAT VHF radar. Journal of Geophysical Research - Space Physics, Volume 121, Issue 11 November 2016, Pages 11,271–11,281en_US
dc.identifier.cristinIDFRIDAID 1431699
dc.identifier.doi10.1002/2016JA023080
dc.identifier.issn2169-9380
dc.identifier.issn2169-9402
dc.identifier.urihttps://hdl.handle.net/10037/11280
dc.language.isoengen_US
dc.relation.journalJournal of Geophysical Research - Space Physics
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437en_US
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437en_US
dc.titleFirst wind shear observation in PMSE with the tristatic EISCAT VHF radaren_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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