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arXiv 0710.2693astro-ph
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太阳光球层II中的大尺度水平流:长期行为和磁活动响应

Large-scale horizontal flows in the solar photosphere II: Long-term behaviour and magnetic activity response

Michal Svanda, Mirek Klvana, Michal Sobotka, Vaclav Bumba

摘要:

最近,我们发展了一种方法,用于绘制大规模的水平速度场在太阳光球。该方法的开发,调整和校准使用的合成数据。现在,我们应用该方法的一系列迈克尔逊多普勒成像仪(MDI)多普勒覆盖几乎一个太阳周期,以获得有关的长期行为的表面流的信息。我们已经发现,我们的方法清楚地再现了广泛接受的平均流场分量的属性,如扭转振荡和纬向环流模式。我们还进行了周期性分析,但由于数据序列长度和较大的间隙,我们没有检测到任何显著的周期。研究了磁活动对平均纬向运动的影响。我们发现了一个证据,即致密磁区的出现局部加速其附近的超颗粒图案的旋转和磁场的存在下,一般减速在赤道区的旋转。我们的研究结果表明,在赤道地区的活动区出现表现出恒定的速度(快60 +/- 9米/秒比卡林顿率),这表明他们出现在0.95 R_太阳的表面径向剪切的基础上,断开其磁根,并在其演变过程中放缓。

英文摘要:

Recently, we have developed a method useful for mapping large-scale horizontal velocity fields in the solar photosphere. The method was developed, tuned and calibrated using the synthetic data. Now, we applied the method to the series of Michelson Doppler Imager (MDI) dopplergrams covering almost one solar cycle in order to get the information about the long-term behaviour of surface flows. We have found that our method clearly reproduces the widely accepted properties of mean flow field components, such as torsional oscillations and a pattern of meridional circulation. We also performed a periodic analysis, however due to the data series length and large gaps we did not detect any significant periods. The relation between the magnetic activity influencing the mean zonal motion is studied. We found an evidence that the emergence of compact magnetic regions locally accelerates the rotation of supergranular pattern in their vicinity and that the presence of magnetic fields generally decelerates the rotation in the equatorial region. Our results show that active regions in the equatorial region emerge exhibiting a constant velocity (faster by 60 +/- 9 m/s than Carrington rate) suggesting that they emerge from the base of the surface radial shear at 0.95 R_sun, disconnect from their magnetic roots, and slow down during their evolution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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