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

机译：螺旋桨的负荷和耗散：AR 7978从摇篮到坟墓的螺旋桨预算

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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，我们从整个衰变过程中出现的孤立有源区域（NOAA 7978）评估了其磁螺旋度预算。使用Yohkoh / SXT图像和在SOHO / MDI磁图上进行的无线性磁力外推，我们计算了电晕的相对磁螺旋度。根据观察到的磁场分布，我们计算通过差动旋转注入的磁螺旋度。然后，使用SOHO / LASCO＆EIT和SXT图像，我们确定了该活动区域在其生命周期内起源的全部26个冠状物质喷射（CME），并估计了通过CME脱落的螺旋度。比较这三个值，我们发现差动旋转既不能提供足够的螺旋度来说明诊断出的冠状螺旋度值，也不能解释CME携带的螺旋度。我们建议磁螺旋的主要来源必须是形成有效区域的磁通管的固有扭曲。

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《Yohkoh 10th Anniversary Meeting on Multi-Wavelength Observations of Coronal Structure and Dynamics Jan 20-24, 2002 Kona, Hawaii, USA》|2002年|p.143-146|共4页
会议地点 Kona HI(US);Kona HI(US)
作者
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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Centre for Plasma Astrophysics, K. U. Leuven, 3001 Leuven, Belgium;

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正文语种 eng
中图分类天文学;
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HELICITY LOADING AND DISSIPATION: THE HELICITY BUDGET OF AR 7978 FROM THE CRADLE TO THE GRAVE

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