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

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

Research output: Contribution to journalArticle

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Abstract

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
Volume34
Issue number19
DOIs
Publication statusPublished - 2007 Oct 16

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COSMIC
ionization
anomalies
anomaly
ionospheric electron density
satellite constellations
radio occultation
subsidence
electron density
winter
ionospherics
summer
FORMOSAT
asymmetry
cross section
radio
plasma
cross sections

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Lin, Chien-Hung ; Liu, J. Y. ; Fang, T. W. ; Chang, P. Y. ; Tsai, H. F. ; Chen, Chia-Hung ; Hsiao, C. C. / Motions of the equatorial ionization anomaly crests imaged by FORMOSAT-3/COSMIC. In: Geophysical Research Letters. 2007 ; Vol. 34, No. 19.
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abstract = "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.",
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Motions of the equatorial ionization anomaly crests imaged by FORMOSAT-3/COSMIC. / Lin, Chien-Hung; Liu, J. Y.; Fang, T. W.; Chang, P. Y.; Tsai, H. F.; Chen, Chia-Hung; Hsiao, C. C.

In: Geophysical Research Letters, Vol. 34, No. 19, L19101, 16.10.2007.

Research output: Contribution to journalArticle

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AU - Lin, Chien-Hung

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AU - Tsai, H. F.

AU - Chen, Chia-Hung

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AB - 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.

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