根據離子飄移速度與電場的關係，來討論說明電離層的季節變化，特別是在赤道異常區的情形。我們利用中華衛星一號IPEI收到的垂直向離子飄移速度，分成四季做分析比較，了解電離層的季節變化與日變化，並取靠近磁赤道附近的資料，觀測某些有變化的物理現象，並做出有效的統計特性。另外，再由理論模擬（TIEGCM）所得的資料，與實際的觀測值比對，分析其結果與誤差。並且由理論模擬所得的其他相關資料，例如東西向離子飄移速度，去探討更多關於電離層變化的機制。

參考文獻
Appleton, E. V., Two anomalies in the ionosphere, Nature, 157, 691, 1946.
Balan, N., and Y. Otsuka, Equinoctial asymmetries in the ionosphere and thermosphere observed by the MU radar, J. Geophys. Res., 103, 9481-9495, 1998.
Croom, S. A., A. R. Robbins, and J. O. Thomas, Variation of electron density in the ionosphere with magnetic dip, Nature, 185, 902, 1960.
Davies, K., Ionospheric Radio, 1990.
Dickinson, R. E., et al., A three-dimensional general circulation model of the thermosphere, J. Geophys. Res., 86, 1499-1512, 1981
Huang, Y.-N., K. Cheng, and S.-W. Chen, On the equatorial anomaly of the ionospheric total electron content near the northern anomaly crest region, J. Geophys. Res., 94, 13515-13525, 1989.
Huey Ching Yeh, Shin-Yi Su, Roderick A. Heelis and Jing-Mei Wu Reprint from Terrestrial, Atmospheric and Oceanic Sciences TAO, Vol. 10, No. 4, 805-820, December 1999
Kelley, M. C., and R. A. Heelis, The Earth’s Ionosphere, Academic Press, San Diego, USA, 1989.
Ratcliffe, J. A., An Introduction to the Ionosphere and Magnetosphere, 256pp., Cambridge, UK, 1972.
Richmond, A. D., Ridley, E. C., and Roble, R. G., A thermosphere/ionosphere general circulation model with coupled electrodynamic, Geophys. Res. Lett., 19, 601, 1992
Roble, R. G and Richmond A. D. , Electrodynamic effects of thermospheric winds from the NCAR thermospheric general circulation model, J. Geophys. Res., 92, 12365-12376, 1987
Torr, M. R., and D. G. Torr, The seasonal behaviour of the F2-layer of the ionosphere, J. Atmos. Terr. Phys., 35, 2237-2251, 1973.
Wenbin Wang, Athermosphere-Ionosphere Nested Grid (TING) Model, in The University of Michigan, 1998
Yonezawa, T., On the seasonal and non-seasonal annual variations and semi-annual variations in the noon and midnight densities of the F2 layer in middle latitudes, II, J. Radio Res. Lab. Jpn., 6, 651, 1959.
Yonezawa, T., Semi-annual variations in the peak electron densities of the F2- and E- layers, J. Radio Res. Lab. Jpn., 19, 1, 1972.
蔡和芳, 全球定位系統觀測電離層赤道異常之研究, 國立中央大學太空科學研究所博士論文, 中壢, 1998
何旭慧, 中華衛星一號觀測電離層電漿氣泡密度變化之統計及研究, 國立中央大學太空科學研究所碩士論文, 中壢, 2000