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Extreme longitudinal variability of plasma structuring in the equatorial ionosphere on a magnetically quiet equinoctial day
Author(s) -
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
Publication year - 2006
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2005rs003366
Subject(s) - ionosphere , scintillation , interplanetary scintillation , daytime , longitude , atmospheric sciences , latitude , environmental science , f region , physics , meteorology , astronomy , plasma , optics , coronal mass ejection , quantum mechanics , detector , solar wind
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.