1991年3月22日耀斑激波的传播特性  

PROPAGATION CHARACTERS OF A SHOCK ASSOCIATED WITH THE FLARE AT 22: 47UT ON MARCH 22, 1991

作　　者：刘绍亮[1] 胡小龙[1] 刘四清[1] 

机构地区：[1]中国科技大学地球和空间科学系,中国科学院日球物理数值开放实验室

出　　处：《地球物理学报》1996年第3期289-295,共7页Chinese Journal of Geophysics

基　　金：国家自然科学基金

摘　　要：采用ＭＨＤ数值方法研究了１９９１年３月２２日２２：４７ＵＴ日面大耀斑引起的行星际激波传播的几何特性，以及初始驱动时间对传播的影响。得出：１．该激波在黄道面投影是非对称的，最快处偏离耀斑法线向东；２．激波面偏离球面，但随着远离太阳这种偏离减小；３．总能相同时，驱动时间短的激波较强，速度较快；能量变化范围相同时，不同初速比不同驱动时间对激波传播速度影响更大。In this paper present a study on geometric propagation characters of a shock associated with the flare at 22: 47UT on 22 March in 1991 using the numerical MHD simulation developed by Hu et al. It is resulted that:1.this shock surface on ecliptic plane is asymmetry, the fastest direction point east of the flare normal; 2. this shock surface deviate from a sphere, but the deviation decrease with heliocentric distance; 3. when the total energy is the same, the driving time shorter the shock stronger and speed faster. In the same range of total energy variation it have an more effect on shock speed for different initial speed than for different driving time.

关 键 词：行星际激波 传播特性 耀斑 太阳 

分 类 号：P182.52[天文地球—天文学]