Extreme longitudinal variability of plasma structuring in the equatorial ionosphere on a magnetically quiet equinoctial day

We investigate the extreme longitudinal variability of equatorial scintillation under quiet magnetic conditions during 22–23 March 2002. Scintillation Network Decision Aid (SCINDA) observations show intense activity in the South American–Atlantic sector during local evening hours, whereas an absence...

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Bibliographic Details
Published in:Radio science 2006-12, Vol.41 (6), p.RS6S24-n/a
Main Authors: McDonald, Sarah E., Basu, Sunanda, Basu, Santimay, Groves, Keith M., Valladares, Cesar E., Scherliess, Ludger, Thompson, Donald C., Schunk, Robert W., Sojka, Jan J., Zhu, Lie
Format: Article
Language:English
Subjects:
data assimilation
Equatorial ionosphere
Ionosphere
Ionospheric irregularities
Modeling and forecasting
scintillation
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Summary:We investigate the extreme longitudinal variability of equatorial scintillation under quiet magnetic conditions during 22–23 March 2002. Scintillation Network Decision Aid (SCINDA) observations show intense activity in the South American–Atlantic sector during local evening hours, whereas an absence of scintillation is seen in the far east Asian sector. Ground‐ and space‐based measurements from SCINDA, the Global Ultraviolet Imager (GUVI), TOPEX, and a chain of GPS receivers are used in combination with the Utah State University Global Assimilation of Ionospheric Measurements (USU‐GAIM) model to explore the relationship between the large‐scale ionization distribution and small‐scale irregularities at low latitudes in both the scintillating and nonscintillating longitude sectors. Our analysis shows that there are significant differences in the evolution of the ionization distributions during the evening hours, which are likely the result of differences in the daytime and postsunset vertical plasma drift in the two sectors. This study demonstrates the importance of USU‐GAIM as a new tool for investigating longitudinal as well as day‐to‐day variability that is observed in the large‐scale distribution of the ionosphere and how this relates to the occurrence of scintillation.
ISSN:0048-6604
1944-799X
DOI:10.1029/2005RS003366