摘要
首先讨论了磁流波传播的线性特征,然后构造了球坐标中一自洽的非等温、非均匀等离子体初态,应用二维时变可压缩磁流体动力学模拟,数值研究了色球层底部压力脉冲所引起扰动的全球传播过程.结果表明,在极区,压力脉冲导致的扰动传播可以区分成两类不同模式的波动;快磁声波与慢磁声波.而在赤道附近,传播扰动是快模磁声波,在源区附近还存在一非传播的扰动.模拟结果的特征有助于解释SOHO/EIT观测到的波动事件.
In the first part of this article, the linear properties of MHD wave propagation is discussed. Then, in order to simulate the global characteristics of wave propagation in the solar chromosphere-corona, by employing a 2-dimensional time-dependent compressible MHD simulation subject to a self-consistent non-isothermal, non-uniform initial state, we study numerically the global propagation process of the disturbances initiated by a pressure pulse implemented at the bottom of chromosphere. Numerical results indicate that, in polar region, propagating disturbances can be distinguished into two modes, i.e. fast and slow magneto-acoustic waves. Whereas in the vicinity of solar equator, propagating disturbance is regarded as fast mode wave, and a standing disturbance is found to be located near the source region. These results may help explaining the wave events observed by SOHO/EIT.
出处
《空间科学学报》
CAS
CSCD
北大核心
2002年第2期103-112,共10页
Chinese Journal of Space Science
基金
国家自然科学基金项目(49834030)
科技部基础研究项目(G2000078405)
