NSSC OpenIR  > 空间科学部
吕建永; 魏奉思; 黄天桥; 北京8701信箱
Source Publication空间科学学报
Keyword日球子午面 盔形电流片 不可压alfvén波
Other AbstractUsing the WKB solutions of incompressible Alfven waves, it is investigated that the propagation of Alfven waves in the background solar wind with a helmet-shaped current sheet obtained by a time-dependent, two dimensional MHD numerical simulation. The results show that: (1) With increasing heliospheric distance, the Alfvenic magnetic amplitude b will decay Tepidly. Near the heliospkeric sheet, the more slowly of the decay, so that the amplitude of b is almost equal everywhere at large distances. (2) Within several solar radii, the velocity fluctuations reach rapidly the maximum at all latitudes, and after that begin to decay gradualy with increasing distances. At large distances the amplitude of“over solar polar is a little larger than near the current sheet. (3) With increasing heliospheric distance, the relative magz}etic field b/B will rise. fiver the solar polar the b/B will increase much more slowly than near the current sheet, but above several solar radii,the values of b/B at all latitudes will no longer increase obviously with increasing distance, that is to say, the evolution of the flutuations will reach the sa called "saturations", this result may be an important support for Alfven wave acceleration of the solar wind. Another important result is that near the helivspheric current sheet,b/B>1 so that Alfvenic fluctuations will be main magnetic field compositions at large distance regions. (4)Near the helivspheric current sheet, the values of the relative velocity fluctuation u/U are the largest and decrease roost repidly , instead u/U varies very slowly over the polar .Within several solar radii, theu /U at all latitudes rapidly becomes vary small, after that at almost same slope and same value, decreases very slowly with increasing distance. Above results show firstly that the propagation nature of polar Alfven waves is different to that near the heliospheric current sheet.
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
吕建永,魏奉思,黄天桥,等. 子午面内Alfvén波的传播特征[J]. 空间科学学报,1994,12(2):93-100.
APA 吕建永,魏奉思,黄天桥,&北京8701信箱.(1994).子午面内Alfvén波的传播特征.空间科学学报,12(2),93-100.
MLA 吕建永,et al."子午面内Alfvén波的传播特征".空间科学学报 12.2(1994):93-100.
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