Motions of the equatorial ionization anomaly crests imaged by FORMOSAT-3/COSMIC

C. H. Lin, J. Y. Liu, T. W. Fang, P. Y. Chang, H. F. Tsai, C. H. Chen, C. C. Hsiao

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The equatorial ionization anomaly (EIA) structures and evolutions are imaged using radio occultation observation of the newly launched FORMOSAT-3/COSMIC (F3/C) satellite constellation. Three-dimensional ionospheric images provide unprecedented detail of the EIA structure globally. This paper presents images of the EIA structures during July-August 2006 and discusses the development and subsidence of the EIA. Clear seasonal asymmetries in both ionospheric electron density and layer height are observed. Two-dimensional (cross section) maps at a meridian provide dynamic variations and motions of the northern and southern EIA crests. Results suggest that in addition to the asymmetric neutral composition effect, interactions between the summer-to-winter (transequatorial) neutral winds and strength of the equatorial plasma fountain effect play important roles in producing asymmetric development of the EIA crests as imaged by the F3/C.

Original languageEnglish
Article numberL19101
JournalGeophysical Research Letters
Issue number19
StatePublished - 16 Oct 2007


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