Evaluation of the IRI model using CHAMP observations in polar and equatorial regions

Huixin Liu, Claudia Stolle, Shigeto Watanabe, Takumi Abe, Martin Rother, David L. Cooke

研究成果: Contribution to journalArticle査読

24 被引用数 (Scopus)

抄録

This study compares the electron density and temperature observed by the CHAMP satellite and those predicted by the International Reference Ionosphere (IRI) model. The comparison has revealed a general agreement between CHAMP and IRI in the seasonal variation of the electron density and temperature. However, in polar regions, the model tends to overestimate the electron density and underestimate the electron temperature. In addition, the CHAMP observes a weaker winter anomaly in the southern hemisphere than in the northern hemisphere, while the IRI predictions are similar in both hemispheres. In the equatorial region, the model describes the dayside equatorial ionization anomaly fairly well, but underestimates its depth in the post-sunset local time sector by about 50%. In polar regions, two prominent spatial structures observed by CHAMP are found to be missing in the IRI prediction. Namely, a band of low electron density along the nightside auroral region and a band of elevated electron temperature near the cusp. The high-Te band near the cusp exhibits clear seasonal variation, with the largest latitude and local time coverage in summer and the smallest in winter.

本文言語英語
ページ(範囲)904-909
ページ数6
ジャーナルAdvances in Space Research
39
5
DOI
出版ステータス出版済み - 2007
外部発表はい

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)

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