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《Chinese Journal of Geophysics》 2005-01
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Features of the polar ionosphere over the Zhongshan station in Antarctic

SHEN Chang-Shou1, ZI Min-Yun1, WANG Jin-Song1, LIU Shun-Lin2, XU Ji-Yao3 1 School of Earth and Space Science, Peking University, Beijing 100871, China 2 Polar Research Center of China, Shanghai 200129, China 3 Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100080, China  
We investigate the features of the polar ionosphere over the Zhongshan station in Antarctic using the data of the ionospheric critical frequencies, f oF 2 and f oE, observed by a Digisonde Portable Sounder(DPS-4) at Zhongshan station of Antarctica in 1996, the hemispheric power index and the midnight equatorward boundary of the aurora estimated by the observation of American NOAA and DMSP satellites. The results show that under a quiet environment of the solar activity and geomagnetic variation at the winter polar night, when the station lies in the center of the polar cleft at magnetic noon, the ionization density of the ionosphere attained to a maximum of the diurnal variation. During several hours before noon and afternoon, the ionized effect of the auroral energy particles is also important. At night the electron density is very low when the station situates at the polar cap area. During the summer polar daylight, the ionized effect of the solar EUV radiation makes the ionospheric electron density much larger and the peak time of the diurnal variation of f oF 2 1-2 hr earlier than that in winter. During a strong geomagnetic disturbance, the locations of both the cleft and aurora move to lower latitudes, and the ionospheric electron density over the Zhongshan station decreases significantly. For a moderate disturbed situation, things become more complex: The strength of ionization caused by soft particles in the cleft around the magnetic noon decreases somewhat, while ionization caused by higher energy particles in the aurora area increases a lot before noon and afternoon.
【Fund】: 国家自然科学基金项目 (4 0 3 740 5 8)、(4 0 13 40 2 0 )、(4 0 2 2 5 0 11);; 国家重点基础研究专项基金项目 (G2 0 0 0 0 7840 7)联合资助
【CateGory Index】: P352
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