追踪超颗粒--这有意义吗？
Tracking of supergranules - Does it make any sense?
摘要：
等离子体的运动和太阳光球层内和下面的结构还没有得到很好的理解。用各种方法得到的结果一般不能认为是一致的，特别是在细节上。在这方面的贡献，我们展示了我们最近开发的方法所获得的结果的总结。为了研究光球动力学，我们应用局部相关跟踪算法对SOHO卫星上的迈克尔逊多普勒成像仪（MDI）获得的一系列全圆盘多普勒图进行了跟踪。多普勒记录的主要结构是超颗粒。在假定超颗粒是由大尺度流场携带的前提下，研究了这一基本速度场的性质。我们进行了对比试验与已知属性的合成数据和时间-距离日震学的结果，取得了很大的成功。几个案例研究表明，该方法的性能。我们相信，在研究太阳光球层中的大规模流动时，对超颗粒的跟踪是非常有意义的。该方法适用于大尺度速度场的探测，有效分辨率为60”，随机误差为15 m/s。我们相信，我们的方法可以提供一个强有力的工具，在太阳光球等离子体的动态行为的研究。
英文摘要：
The motions of the plasma and structures in and below the solar photosphere is not well understood. The results obtained using various methods cannot be in general considered as consistent, especially in details. In this contribution we show a summary of the results obtained by the method we have developed recently. To study the photospheric dynamics we apply the local correlation tracking algorithm to the series of full-disc Dopplergrams obtained by Michelson Doppler Imager (MDI) aboard the SOHO satelite. The dominant structure recorded in Dopplergrams is the supergranulation. Under the assumtion that the supergranules are carried by the flow field of the larger scale, we study properties of this underlying velocity field. We perform comparative tests with synthetic data with known properties and with results of the time-distance helioseismology with a great success. A few case studies are shown to demonstrate the performance of the method. We believe that tracking of supergranules makes a perfect sense when studying the large-scale flows in the solar photosphere. The method we demonstrate is suitable to detect large-scale velocity field with effective resolution of 60" and random error of 15 m/s. We believe that our method may provide a powerful tool for studies related to the dynamic behaviour of plasmas in the solar photosphere.
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