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dc.contributor.authorLee, Young-Sook
dc.contributor.authorKim, Young Ha
dc.contributor.authorKim, Kyung-Chan
dc.contributor.authorKwak, Young-Sil
dc.contributor.authorSergiengko, Timothy
dc.contributor.authorKirkwood, Sheila
dc.contributor.authorJohnsen, Magnar Gullikstad
dc.date.accessioned2019-01-14T12:39:55Z
dc.date.available2019-01-14T12:39:55Z
dc.date.issued2018-06-04
dc.description.abstractBy analyzing a data set from the European Incoherent SCATter (EISCAT) Very High Frequency (VHF) radar at Tromsø, we find that both radar reflectivity and upward ion velocity in a polar mesospheric summer echo (PMSE) layer simultaneously increased at the commencement of a local geomagnetic disturbance, which occurred at midnight on 9 July 2013. The onset of the upward velocity was followed by periodic repetition of ~5 min during the initial 30‐min stage, and then at later stage the vertical velocity oscillated with ~7‐ and ~20‐min periodicities at 85‐ to 90‐km altitudes. The ~5‐min periodicity is close to the buoyancy period, and the ~7‐ and ~20 min periodicities are consistent with gravity waves, thus suggesting that gravity waves can be generated by the effects of the geomagnetic disturbance. On the other hand, the variation of PMSE intensity (85–90 km) was in phase with fluctuations of electron densities (90–110 km) with ~12‐ and ~13‐min periodicities at the initial and later stages, respectively. The initial creation of PMSE can be attributed to both the sudden onset of particle precipitation and ice particles produced by adiabatic cooling during the rapid updraft, as detected by large upward velocity. Our periodogram analysis suggests that variations of PMSE intensity seem to follow the same periods with E region electron density, which is moduled by energetic electron precipitation, while vertical velocity oscillates at atmospheric gravity wave periods.en_US
dc.description.sponsorshipKMA/NMSC (Korea Meteorological Administration/National Meteorological Satellite Center)en_US
dc.descriptionSource at <a href=https://doi.org/10.1029/2018JA025399> https://doi.org/10.1029/2018JA025399</a>.en_US
dc.identifier.citationLee, Y.-S., Kim, Y.H., Kim, K.-C., Kwak, Y.-S., Sergiengko, T., Kirkwood, S. & Johnsen, M.G. (2018). EISCAT Observation of Wave‐Like Fluctuations in Vertical Velocity of Polar Mesospheric Summer Echoes Associated With a Geomagnetic Disturbance. <i>Journal of Geophysical Research - Space Physics</i>, 123(6), 5182-5194. https://doi.org/10.1029/2018JA025399en_US
dc.identifier.cristinIDFRIDAID 1599112
dc.identifier.doi10.1029/2018JA025399
dc.identifier.issn2169-9380
dc.identifier.issn2169-9402
dc.identifier.urihttps://hdl.handle.net/10037/14443
dc.language.isoengen_US
dc.publisherAmerican Geophysical Union (AGU)en_US
dc.relation.journalJournal of Geophysical Research - Space Physics
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430en_US
dc.subjectPMSEen_US
dc.subjectEISCATen_US
dc.subjectD regionen_US
dc.subjectgeomagnetic stormen_US
dc.subjectgravity waveen_US
dc.titleEISCAT Observation of Wave‐Like Fluctuations in Vertical Velocity of Polar Mesospheric Summer Echoes Associated With a Geomagnetic Disturbanceen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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