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HELICITY LOADING AND DISSIPATION: THE HELICITY BUDGET OF AR 7978 FROM THE CRADLE TO THE GRAVE

机译：螺旋性装载和耗散：AR 7978从摇篮到坟墓的肝智预算

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Through a multi-wavelength and multi-instrument analysis we evaluate the magnetic helicity budget of an isolated active region (NOAA 7978) from its emergence throughout its decay. Using Yohkoh/SXT images and linear force-free magnetic extrapolations carried out on SOHO/MDI magnetograms, we compute the relative magnetic helicity in the corona. Based on the observed magnetic field distribution we calculate the magnetic helicity injected by differential rotation. Then, using SOHO/LASCO & EIT and SXT images we identify all the 26 coronal mass ejections (CMEs) which originated from this active region during its lifetime and we estimate the amount of helicity which was shed via CMEs. Comparing these three values we find that the differential rotation can neither provide enough helicity to account for the diagnosed coronal helicity values, nor for the helicity carried away by CMEs. We suggest that the main source of the magnetic helicity must be the inherent twist of the magnetic flux tube forming the active region.

机译：通过多波长和多仪器分析，我们评估孤立的有源区（NOAA 7978）的磁肝脏预算从整个衰减的出现。在SOHO / MDI磁图上进行的使用Yohkoh / SXT图像和线性的无力磁外推，我们计算了电晕中的相对磁螺旋。基于观察到的磁场分布，我们计算差分旋转注入的磁螺旋。然后，使用SOHO / LASCO＆EIT和SXT图像，我们在其寿命期间识别源自该活性区域的所有26个冠状质量喷射（CMES），并且估计通过CMES脱落的螺旋状度。比较这三个值我们发现差分旋转既不能提供足够的螺旋，以考虑诊断冠状螺旋值，也不能够通过CMES承载的螺旋。我们建议磁螺旋的主要来源必须是形成有源区的磁通管的固有扭转。

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《COSPAR colloquium》|2002年||共4页
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L. van Driel-Gesztelyi; P. Demoulin; C. H. Mandrini; S. Plunkett; B. Thompson; Zs. Koevari; G. Aulanier; A. Young; M. Lopez Fuentes; S. Poedts;
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中图分类实测天体物理学;
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HELICITY LOADING AND DISSIPATION: THE HELICITY BUDGET OF AR 7978 FROM THE CRADLE TO THE GRAVE

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