南极中山站午后极光强度与太阳风参数的关系

DEPENDENCE OF THE POSTNOON AURORAL INTENSITY UPON THE SOLAR WIND PARAMETERS

本文利用 1 997年和 1 998年南极中山站多通道扫描光度计的地面观测数据和 WIND卫星在弓激波上游对太阳风参数的观测数据 ,对午后高纬极光强度与太阳风等离子体密度、动压以及太阳风速度之间的相关性进行了定量研究。研究表明 ,午后极光 6 3 0 .0 nm的强度与太阳风等离子体参数之间有较好的相关 ,6 3 0 .0 nm的强度表现出随太阳风等离子体密度、动压和速度的增大而增加的趋势 ,其相关系数分别为 0 .84、0 .88和 0 .6 1 ;而 5 5 7.7nm极光的强度与太阳风等离子体参数之间的相关较差。午后 5 5 7.7nm和 6 3 0 .0 nm对太阳风参数的不同响应表明太阳风对 6 3 0 .0 nm影响更直接 ,而 5 5 7.

Based on auroral observations of a multi channels scanning photometer at Zhongshan Station, Antarctica and solar wind parameters data obtained by WIND Satellite at the upstream of the bow shock in 1997 and 1998, the dependence of the high latitude postnoon auroral intensity upon the solar wind parameters are studied quantitatively. It is shown that the 630 0nm intensity depends on the solar wind parameters more directly than the 557 7nm does. The 630 0nm intensity increases as the solar wind plasma density, dynamic pressure and speed increasing, with a correlation coefficient of 0 84, 0 88 and 0 61 respectively. While the dependence of 557 7nm intensity upon the solar wind parameters are not so clear. The difference between the dependences of 630 0nm and 557 7nm intensities upon the solar wind parameters indicates that the 630 0nm emission is influenced by solar wind more directly than the 557 7nm is, while the 557 7nm emission is related to magnetospheric dynamic processes sometimes.