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南北极冬季F2层电离层特性对比研究

【标题】南北极冬季F2层电离层特性对比研究

【Title】COMPARATIVE STUDY OF WINTER POLAR IONOSPHERIC F2 LAYER IN BOTH HEMISPHERES

【作者】 朱爱琴; 张北辰; 黄际英; 刘瑞源

【Author】 Zhang Beichen ; Liu Ruiyuan

【期刊】极地研究

【Journal】

【期刊年份】2008

【卷】20

【期】

【关键词】 极区电离层; foF2; 中山站; Tromso站

【Keywords】

【摘要】利用南极中山站和北极Tromso站1996、1997、1998及2002年的测高仪观测数据,对中山站(6月份)和Tromso站(12月份)上空冬季foF2的日变化特性进行了对比研究,结合数值模拟结果,分析了中山站和Tromso站F2层电离层的极区特征,进一步揭示了极区电离层特征的形成机理。结果表明,中山站和Tromso站虽然地理纬度接近,foF2日变化形成机理不完全相同。由于地磁纬度的差异,极区对流与日侧光致电离的相互作用造成了两站日侧电离层的不同变化形态,中山站foF2日变化主峰出现在磁地方时中午附近,而Tromso站foF2日变化主峰出现在地方时正午附近;两站日侧foF2受太阳辐射流量影响较大,极光沉降粒子电离在太阳活动低年对中山站foF2日变化形态影响显著。

【Abstract】Diurnal variations of ionospheric F2 layer at Zhongshan (Jun.) and Tromso (Dec.) in winter are comparatively studied by analyzing the data from DSP-4 in 1996, 1997, 1998 and 2002. Combining the results of the numerical simulation, we analyzed the main physical processes which are responsible for the F region ionosphere over Zhongshan and Tromso. The results show that, although both Zhongshan and Tromso have similar geographic latitudes, the mechanisms of the foF2 diurnal variation are not always the same. As a result of the strong interaction between sunlit ionization and horizontal convection, the major peak in the diurnal variation of foF2 at Zhongshan appears around geomagnetic local noon, while the F region at Tromso is less influenced by the horizontal convection on the dayside, making the major peak in the foF2 diurnal variation at about local noon. The foF2 diurmal variations at the both stations are greatly influenced by solar radiation flux, and the auroral particle precipitation has a notable influence on the foF2 diurnal variation at Zhongshan station in solar minimum.

【基金/项目】

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