Observational cross helicity on the solar surface

被引：1
|
作者：
Zhao MingYu [1 ]
Wang XiaoFan [1 ]
Zhang HongQi [1 ]
机构：
[1] Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
来源：
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY | 2014年 / 57卷 / 03期
基金：
中国国家自然科学基金;
关键词：
cross helicity; photosphere; magnetic fields; solar activity; TIME;
D O I：
10.1007/s11433-013-5174-6
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We analyzed the correlation of the solar magnetograms and Dopplergrams from SOHO/MDI and SDO/HMI respectively. It is found that the full disk correlation coefficient of Dopplergrams is more than 0.80 between SOHO/MDI and SDO/HMI. The full disk correlation coefficient of magnetograms is about 0.73 and is more than 0.95 for active regions only. We also analyzed the distribution of the cross helicity (velocity-magnetic-field correlation) on the solar surface. It is found that the latitude distributions of the cross helicity based on SOHO/MDI data and SDO/HMI data have similar tendencies, and in the analysis of solar active regions the amplitude of the horizontal component of the mean cross helicity is about two times the line-of-sight one.
引用
收藏
页码：589 / 596
页数：8
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