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  A synoptic‐scale wavelike structure in the nighttime equatorial ionization anomaly.

Rodríguez-Zuluaga, J., Stolle, C., Yamazaki, Y., Xiong, C., England, S. (2021): A synoptic‐scale wavelike structure in the nighttime equatorial ionization anomaly. - Earth and Space Science, 8, 2, e2020EA001529.
https://doi.org/10.1029/2020EA001529

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5004911 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5004911_7
Genre: Journal Article

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 Creators:
Rodríguez-Zuluaga, J.1, Author              
Stolle, Claudia1, Author              
Yamazaki, Yosuke1, Author              
Xiong, C.1, Author              
England, S.L.2, Author
Affiliations:
12.3 Geomagnetism, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146030              
2External Organizations, ou_persistent22              

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Free keywords: DEAL Wiley. Equatorial Ionization Anomaly; Equatorial Ionosphere; Equatorial Plasma Bubbles; Wave structure; Forcing from below
 Abstract: Both ground‐ and satellite‐based airglow imaging have significantly contributed to our understanding of the low‐latitude ionosphere, especially of 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°W. This region is of particular interest at low magnetic latitudes because of the high magnetic declination (i.e., about ‐20°) and proximity of the South Atlantic magnetic anomaly. Nighttime airglow images from GOLD reveal an exciting feature of the EIA. Using observations from 5 October 2018 to 30 June 2020, we characterize a wavelike structure of few thousands of kilometers seen as poleward and equatorward displacements of the nighttime 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° latitude and around 20° and 60° longitude (i.e., in geographic longitude at the dip equator, about 53°W and 14°W). The wavelike structure presents typical zonal wavelengths of about 6.7 × 103 km and 3.3 × 103 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.

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Language(s): eng - English
 Dates: 2020-12-212020-10-222020-12-272021-01-182021
 Publication Status: Finally published
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2020EA001529
GFZPOF: p4 T1 Atmosphere
GFZPOFWEITERE: p4 MESI
OATYPE: Gold - DEAL Wiley
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Project name : Dynamic Earth
Grant ID : -
Funding program : SPP 1788 (255388522)
Funding organization : Deutsche Forschungsgemeinschaft (DFG) (VR 2030)

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Title: Earth and Space Science
Source Genre: Journal, SCI, Scopus, oa
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Pages: - Volume / Issue: 8 (2) Sequence Number: e2020EA001529 Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/180712
Publisher: American Geophysical Union (AGU)