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High-resolution Studies of the Polar Magnetic Fields during Cycle 23

机译：周期23期间极性磁场的高分辨率研究

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摘要

High-resolution mosaics of the solar polar magnetic fields have been constructed using individual magnetograms obtained with the video magnetograph of the Big Bear Solar Observatory, and the properties of these mosaics are demonstrated in this paper. The mosaics show selected regions of the polar fields on several days during the rising phase of Cycle 23, and are related to the global polar fields (i) by superposing the mosaic for a given day on to a full-disk SOHO-MDI magnetogram obtained on the same day, (ii) by plotting the mosaics in polar projection and using these to identify the approximate regions reported by the mosaics on the NSOKP polar synoptic plots, and (iii) by imposing the locations of the Hα filaments on to the mosaics in order to infer the neutral lines of the large-scale fields. We have studied the fine structure of the large-scale unipolar fields near the poles and, in particular, have constructed histograms of the magnetic field intensities within particular regions of the mosaics and, in this way, have estimated the ratios of the number of magnetic knots of opposite polarities within the unipolar plumes. We have also generated enlargements of the polar regions of the NSOKP daily magnetograms. These and statistical studies have shown that on days for which the BBSO mosaics are not available, the NSOKP enlargements may be used to study the high-resolution polar fields. Time-series of mosaics obtained over four-hour periods on September 6 and November 18 show that considerable evolution in the structure of existing flux knots and the formation of several new knots has taken place during these periods.
机译：利用北极熊天文台的视频磁强仪获得的单个磁图，构造了太阳极磁场的高分辨率镶嵌图，并在本文中演示了这些镶嵌图的特性。镶嵌图显示了在第23个周期的上升阶段中几天内极场的选定区域，并且通过将镶嵌图在给定的一天内叠加到获得的全磁盘SOHO-MDI磁图上，与全局极场（i）相关在同一天，（ii）通过在极角投影中绘制镶嵌图，并使用它们来确定NSOKP极地天气图上镶嵌图所报告的大致区域，以及（iii）通过将Hα细丝的位置施加到镶嵌图上为了推断大范围的中性线。我们研究了极附近的大型单极场的精细结构，尤其是构造了马赛克特定区域内磁场强度的直方图，并以此方式估算了磁数的比率单极羽流中极性相反的结。我们还生成了NSOKP日磁图的极区的放大图。这些和统计研究表明，在没有BBSO马赛克的日子，可以使用NSOKP扩大来研究高分辨率极化场。在9月6日和11月18日的四个小时内获得的镶嵌图的时间序列显示，在这些时期内，现有通量结的结构发生了相当大的变化，并且形成了几个新的结。

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  • 来源
    《Solar Physics》 |2002年第2期|231-247|共17页
  • 作者

    J. Varsik; C.J. Durrant; J. Turner; P.R. Wilson;

  • 作者单位

    Big Bear Solar Observatory NJIT;

    School of Mathematics and Statistics University of Sydney;

    School of Mathematics and Statistics University of Sydney;

    School of Mathematics and Statistics University of Sydney;

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