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冕环中扭转Alfvén波和快波的耦合共振
Alternative TitleALFVEN WAVE AND FAST WAVE COUPLING RESONANCE IN CORONAL LOOPS
叶占银; 魏奉思; 王赤; 冯学尚; 罗庆宇; 北京8701信箱
Department空间天气学国家重点实验室
Source Publication空间科学学报
2004
Volume24Issue:6Pages:401-411
ISSN0254-6124
Language中文
Keyword角频率 近似 间断 耗散 数系 共振 耦合 波幅 扭转 位置
Abstract推广完备正交函数系(OFSE)展开方法,应用它研究冕环中无耗散扭转Alfvén波和快波耦合的时变过程.采用这种方法,从数学上描述了总体波模的固有角频率,从理论和数值计算结果两方面分析了Alfvén波和快波耦合时冕环中磁力线Alfvén波固有角频率.采用这种方法,分析了耦合驱动项和Alfvén波共振的关系.计算结果给出了耦合共振出现位置Alfvén波和快波的波幅特征,发现如果足点驱动角频率不等于冕环总体波模的固有角频率,在耦合共振位置当扭转Alfvén波幅出现δ断面时,怏波振幅沿径向梯度很大,有时近似为一个间断,非常有利于快波耗散;如果足点驱动角频率等于总体波模的固有角频率,Alfvén波振幅出现δ断面时在径向出现丰富的小尺度结构,共振位置近似为一个间断,非常有利于Alfvén波耗散.
Other AbstractComplete Orthogonal Function Series Expansion (OFSE} method is generalized and applied to make research about the time evolution coupling process of fast and Alfven waves in coronal loops.With the OFSE method, intrinsic angular frequencies of coronal loop quasi-modes could be described mathematically and the intrinsic angular frequency of torsional Alfven waves in every magnetic field line of coronal loops is investigated theoretically and numerically.With the method, the relationship between a coupling driven term and torsional Alfven wave resonance is analyzed.Numerical result presents wave amplitude features at the coupling resonant place. It is found that: when the footpoint driven angular frequency is not equal to one of quasi-mode intrinsic angular frequencies, at the resonant position with a b profile of Alfven wave amplitude,absolute value of radial gradient of fast wave amplitude is very large and approximates a discontinuity, which is necessary to dissipate fast waves. On the other hand, if the footpoint driven angular frequency is equal to one of quasi-mode intrinsic angular frequencies, widespread small scale structure of Alfven wave amplitude and an approximate discontinuity at resonant place,which are necessary to dissipate Alfven waves,appear.
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1404
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
叶占银,魏奉思,王赤,等. 冕环中扭转Alfvén波和快波的耦合共振[J]. 空间科学学报,2004,24(6):401-411.
APA 叶占银,魏奉思,王赤,冯学尚,罗庆宇,&北京8701信箱.(2004).冕环中扭转Alfvén波和快波的耦合共振.空间科学学报,24(6),401-411.
MLA 叶占银,et al."冕环中扭转Alfvén波和快波的耦合共振".空间科学学报 24.6(2004):401-411.
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