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Magnetic helicity transport in corona and filament eruptions

机译：电晕和细丝爆发中的磁螺旋传输

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摘要

Using a 28-hour time series of line-of-sight magnetograms taken by the Michelson Doppler Imager (MDI), we determined the magnetic flux variations and the rate of magnetic helicity transport at the footpoints of a filament in active region NOAA 8375. The filament was characterized by a positive helicity change due to shearing motions in both footpoints and showed several partial eruptions during the observing time. In particular, we considered 4 events registered in the Hα daily reports of Solar Geophysical Data. We found a strong temporal correlation between filament eruptions and helicity transport from the photospheric magnetic structures at the filament footpoints into the corona: in at least one footpoint, all of the events were preceded by an evident increase and followed by a small decrease of the emerging magnetic flux and of the magnetic helicity change due to shearing motions. We compared these two mechanisms of helicity transport and found that the predominant role to drive filament instability is played by emergence of new magnetic flux from the convection zone.
机译：使用由迈克尔逊多普勒成像仪（MDI）拍摄的28小时时间序列的视线磁图，我们确定了活动区域NOAA 8375中细丝脚部的磁通量变化和磁螺旋传输速率。长丝的特征是由于在两个脚上的剪切运动而导致的正螺旋度变化，并且在观察时间内显示出几次局部喷发。特别是，我们考虑了在太阳地球物理数据的Hα日报中注册的4个事件。我们发现灯丝爆发与螺旋光从灯丝脚位处的光球磁性结构进入日冕之间的时间相关性很强：在至少一个脚位处，所有这些事件之前都有明显的增加，随后出现的小幅减少磁通量和磁螺旋度由于剪切运动而改变。我们比较了螺旋传输的这两种机制，发现驱动细丝不稳定性的主要作用是来自对流区的新磁通的出现。

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  • 来源
    《Solar Physics》 |2003年第2期|137-150|共14页
  • 作者

    P. Romano; L. Contarino; F. Zuccarello;

  • 作者单位

    Dipartimento di Fisica e Astronomia Universitá di Catania Città;

    Dipartimento di Fisica e Astronomia Universitá di Catania Città;

    Dipartimento di Fisica e Astronomia Universitá di Catania Città;

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