耀斑引发的激波初始速度对激波到达时间预测的影响  

Influence of the initial shock speed excited by solar flares on shock arrival time prediction

作　　者：罗浩[1,3] 陈耿雄[1] 杜爱民[1,4] 孙炜[2] 徐文耀[1] 张莹[1] 赵旭东[1] 王源[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]美国阿拉斯加大学费尔班克斯分校地球物理研究所,阿拉斯加99701 [3]中国科学院研究生院,北京100049 [4]中国科学院空间天气学国家重点实验室,北京100190

出　　处：《地球物理学报》2011年第8期1945-1952,共8页Chinese Journal of Geophysics

基　　金：国家重点基础研究发展计划项目(2011CB811404);公益性行业(气象)科研专项经费项目(GYHY200806024,GYHY(QX)2007-613)资助

摘　　要：利用Hakamada-Akasofu-Fry运动学太阳风模型模拟了1981到1985卡林顿周的48个太阳耀斑事件激发的激波到达地球的时间.结果表明,对模式输入参数之一的激波初始速度进行调整,可以使模拟结果和实际观测基本一致.通过对发生在该时期多个事件的统计分析,分别得到日球表面东、西两半球耀斑爆发对应的激波初始速度调整因子和初始速度的统计关系.该关系应用到1986到1990卡林顿周期间发生的耀斑对应的激波到达地球时间的模拟时,对于位于西(东)半球的耀斑,预测行星际激波到达地球所需时间的平均绝对误差从未使用该关系的16(15)h降低到12(11)h.By using Hakamada-Akasofu-Fry flare events during Carrington Rotation 1981 time with observations by satellites at 1 AU. deduced from the metric Type Ⅱ radio burst （HAF） solar wind model, we simulated 48 solar to 1985 and compared the simulated shock arrival It is found that the initial solar wind shock speed observations plays an important role in the shock arrival time prediction. The match between predicted and observed shock arrival times （SATs） was considerably improved by iteratively adjusting the initial shock speed. We obtained the adjustment factors as a function of the initial shock speed for different hemispheres by statistical analysis and applied them to adjust the initial shock speed driven by the solar flares which occurred in the following five Carrington rotations （1986-1990）, the mean absolute error of the shock arrival time was reduced from 16 （15） hours to 12 （11） hours for the flare occurred on the western （eastern） hemisphere. This indicates that there can be significant improvements for the shock arrival time prediction by adjusting the initial shock speed using the statistical functions.

关 键 词：HAF模型 初始太阳风激波速度 激波到时 Ⅱ型射电爆发 

分 类 号：P353[天文地球—空间物理学]