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Alternative TitleFeatures of the polar ionosphere over the Zhongshan station in Antarctic
沈长寿; 资民筠; 王劲松; 刘顺林; 徐寄遥; 北京8701信箱
Source Publication地球物理学报
Keyword电离层fof2和foe 极隙区软粒子沉降 极光区粒子电离 太阳euv辐射
Abstract本文利用 1996年的电离层数字测高仪DPS 4所测的foF2 、foE以及从美国NOAA和DMSP卫星观测估算的半球功率指数和午夜极光区赤道侧边界纬度等资料 ,考察中山站电离层的极区特征 .结果表明 ,在太阳和地磁宁静环境下 ,冬季极夜磁正午中山站处于极隙区中心时 ,电离层内的电离密度达全天的最大值 ;上、下午各有数小时间隔位于极光带内时 ,高能粒子的电离作用也很重要 ;夜间进入极盖区后 ,电子密度则很低 .夏季极昼时 ,太阳EUV辐射的电离效应使电离层电离密度比冬季值大许多 ,而且 ,日变化的最大值时间也提前了 1~ 2h .强磁扰时 ,极隙区和极光带均向低纬侧移动 ;中山站上空的电子密度会大幅度下降 .在中等扰动环境下情况更加复杂 :磁正午前后极隙区内软粒子沉降的电离强度有所减小 ,而上、下午极光区内的高能粒子电离则有较大增加 .
Other AbstractWe 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 rolar ECTV radiation makes the ionospheric electron density much larger and the peak time of the diurnal variation of f0 Fz 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 romewhat,while ionization caused by higher energy particles in the aurora area increases a lot before noon and afternoon.
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
沈长寿,资民筠,王劲松,等. 南极中山站电离层的极区特征[J]. 地球物理学报,2005,48(1):1-6.
APA 沈长寿,资民筠,王劲松,刘顺林,徐寄遥,&北京8701信箱.(2005).南极中山站电离层的极区特征.地球物理学报,48(1),1-6.
MLA 沈长寿,et al."南极中山站电离层的极区特征".地球物理学报 48.1(2005):1-6.
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