Observational cross helicity on the solar surface  

作　　者：ZHAO MingYu WANG XiaoFan ZHANG HongQi 

机构地区：[1]Key Laboratory of Solar Activity,National Astronomical Observatory,Chinese Academy of Sciences

出　　处：《Science China(Physics,Mechanics & Astronomy)》2014年第3期589-596,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.10611120338,10673016,10733020,10921303,41174153 and 11103041);the National Basic Research Program of China(973 Program)(Grant No.2006CB806301)

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.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 coefcient of Dopplergrams is more than 0.80 between SOHO/MDI and SDO/HMI.The full disk correlation coefcient 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.

关 键 词：cross helicity photosphere magnetic fields solar activity 

分 类 号：P182.9[天文地球—天文学]