选址与日冕观测组知识库

过去的一系列研究表明在太阳光球表面,随着纵向磁场的增强,对应区域所观测到的震波能量随之降低.为了进一步研究震波和磁场的关系,使用日震和磁成像仪(Helioseismic and Magnetic Imager,HMI)的数据,通过对视向磁场进行势场外推得到磁场总强度,与震波能量进行关联.对一定总磁场区域的p模式震波能量拟合可以得到其随总磁场强度而变化的关系.研究证实了震波能量与磁场总强度有更强关联.不同活动区的结果表明p模式震波能量随着磁场总强度增加而下降的趋势在500 Gs以下非常接近,在500 Gs至1000 Gs范围内有略微差别.并且p模式震波能量的对数与总磁场强度有较强的线性相关性.对比迈克尔逊多普勒成像仪(Michelson Doppler Imager,MDI)和HMI得到的结果时发现,虽然MDI观测的磁场结果整体会比HMI观测结果偏大,但归一化p模式震波能量与磁场强度的关系分析对比结果相差不大.

A series of researches have shown that with the increase of the line-of-sight (LOS) magnetic field intensity, the solar surface acoustic power decreases. We use the observed HMI (Helioseismic and Magnetic Imager) LOS magnetic field intensity and the method of the potential field extrapolation to calculate the total magnetic field intensity, and relate it to the acoustic p-mode power. Using our fitting method, we could get the relationship between the surface acoustic p-mode power and the total magnetic field intensity. It is found from our research that the acoustip p-mode power is strongly related to the total magnetic field intensity. The results of different active regions have shown that the relationship of the normalized p-mode power and the total magnetic field intensity is the same under 500 Gs, and is quite close within the range from 500 Gs to 1000 Gs. Also the logarithm of the p-mode power and the total magnetic field intensity has a very strong linear correlation. We compared the results between the HMI and MDI (Michelson Doppler Imager) instruments. It is found that although the magnetic field measurement of MDI is much higher than that of HMI, the comparison of the relationship between the normalized p-mode power and magnetic field intensity shows a little difference between the HMI and MDI instruments.