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A Synoptic-Scale Wavelike Structure in the Nighttime Equatorial Ionization Anomaly

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dc.contributor.authorRodriguez-Zuluaga, J.en
dc.contributor.authorStolle, Claudiaen
dc.contributor.authorYamazaki, Y.en
dc.contributor.authorXiong, C.en
dc.contributor.authorEngland, Scott L.en
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2021-05-24T14:24:11Zen
dc.date.available2021-05-24T14:24:11Zen
dc.date.issued2021-02en
dc.description.abstractBoth ground- and satellite-based airglow imaging have significantly contributed to understanding the low-latitude ionosphere, especially the morphology and dynamics of the equatorial ionization anomaly (EIA). The NASA Global-scale Observations of the Limb and Disk (GOLD) mission focuses on far-ultraviolet airglow images from a geostationary orbit at 47.5 degrees W. This region is of particular interest at low magnetic latitudes because of the high magnetic declination (i.e., about -20 degrees) and proximity of the South Atlantic magnetic anomaly. In this study, we characterize an exciting feature of the nighttime EIA using GOLD observations from October 5, 2018 to June 30, 2020. It consists of a wavelike structure of a few thousand kilometers seen as poleward and equatorward displacements of the EIA-crests. Initial analyses show that the synoptic-scale structure is symmetric about the dip equator and appears nearly stationary with time over the night. In quasi-dipole coordinates, maxima poleward displacements of the EIA-crests are seen at about +/- 12 degrees latitude and around 20 and 60 degrees longitude (i.e., in geographic longitude at the dip equator, about 53 degrees W and 14 degrees W). The wavelike structure presents typical zonal wavelengths of about 6.7 x 10(3) km and 3.3 x 10(3) km. The structure's occurrence and wavelength are highly variable on a day-to-day basis with no apparent dependence on geomagnetic activity. In addition, a cluster or quasi-periodic wave train of equatorial plasma depletions (EPDs) is often detected within the synoptic-scale structure. We further outline the difference in observing these EPDs from FUV images and in situ measurements during a GOLD and Swarm mission conjunction.en
dc.description.notesThe authors thank Hermann Luhr for fruitful discussions. This study was supported by the German Research Foundation (DFG) through the Special Priority Programme 1788 "Dynamic Earth." SLE was supported by NASA contract 80GSFC18C0061. The authors acknowledge the support from the International Space Science Institute (ISSI) through the International Team "An Exploration of the Valley Region in the Low Latitude Ionosphere: Response to Forcing from Below and Above and Relevance to Space Weather." Open Access funding enabled and organized by ProjektDEAL. WOA Institution: N/A Blended DEAL: ProjektDEAL.; Open access funding enabled and organized by Projekt DEAL.en
dc.description.sponsorshipGerman Research Foundation (DFG)German Research Foundation (DFG) [1788]; NASANational Aeronautics & Space Administration (NASA) [80GSFC18C0061]; International Space Science Institute (ISSI); Projekt DEALen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1029/2020EA001529en
dc.identifier.eissn2333-5084en
dc.identifier.issue2en
dc.identifier.othere2020EA001529en
dc.identifier.urihttp://hdl.handle.net/10919/103455en
dc.identifier.volume8en
dc.language.isoenen
dc.rightsCreative Commons Attribution-NonCommercial 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/en
dc.subjectequatorial ionization anomalyen
dc.subjectequatorial ionosphereen
dc.subjectequatorial plasma bubblesen
dc.subjectwave structureen
dc.subjectforcing from belowen
dc.titleA Synoptic-Scale Wavelike Structure in the Nighttime Equatorial Ionization Anomalyen
dc.title.serialEarth and Space Scienceen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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