| 南极中山站电离层F2层临界频率变化特征 |
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| 引用本文： | 徐中华,刘瑞源,刘顺林,张北辰,胡红桥,綦欣.南极中山站电离层F2层临界频率变化特征[J].地球物理学报,2006,49(1):1-1. |
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| 作者姓名： | 徐中华 刘瑞源 刘顺林 张北辰 胡红桥 綦欣 |
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| 作者单位： | 中国极地研究中心，上海 200129 |
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| 基金项目： | 国家自然科学基金项目(40236058,40474061,40574066和40390154)资助. |
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| 摘 要： | 对南极中山站数字式电离层测高仪1995～2002年观测数据的月中值进行了统计分析，揭示了中山站电离层F2层临界频率（foF2）的主要特征：foF2存在明显的日变化和年变化；日变化存在“磁中午异常”现象；年变化中中午foF2在太阳活动低年不出现“冬季异常”，在太阳活动高年出现“半年异常”，即两分点高于两至点.本文结合中山站所处的地理位置，考虑太阳辐射电离、磁层的驱动和中性大气成分变化等因素，分析了这些现象的产生机理.
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| 关 键 词： | 电离层 南极 中山站 foF2 |
| 文章编号： | 0001-5733（2006）01-0001-08 |
| 收稿时间： | 2005-06-01 |
| 修稿时间： | 2005-09-10 |
Variations of the ionospheric F2 layer critical frequency at Zhongshan Station, Antarctica |
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| XU Zhong-Hua,LIU Rui-Yuan,LIU Shun-Lin,ZHANG Bei-Chen,HU Hong-Qiao,QI Xin.Variations of the ionospheric F2 layer critical frequency at Zhongshan Station, Antarctica[J].Chinese Journal of Geophysics,2006,49(1):1-1. |
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| Authors: | XU Zhong-Hua LIU Rui-Yuan LIU Shun-Lin ZHANG Bei-Chen HU Hong-Qiao QI Xin |
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| Institution: | Polar Research Institute of China, Shanghai 200129, China |
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| Abstract: | With the statistical analysis of the monthly medians from 1995 to 2002 of the DPS 4 ionospheric sounder at Zhongshan Station, Antarctica, main features of the ionospheric critical frequency (foF2) are revealed. The result shows that the frequency foF2 has obvious diurnal and annual variations. There is a “magnetic noon anomaly" of the diurnal variation. The “winter anomaly" of the annual variation does not occur at local noon at solar minimum, while the “semi annual anomaly" occurs at solar maximum, which means foF2 is larger at equinoxes than at solstices. The physical mechanisms of these phenomena are discussed according to ionization of solar radiation, the driven factors from magnetosphere and variations of neutral components of the atmosphere at the location of Zhongshan Station. |
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| Keywords: | Ionosphere Antarctica Zhongshan Station f_oF_2 |
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