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Time‐Latitude Distribution of Prominences for 10 Solar Cycles: A Study Using Kodaikanal, Meudon, and Kanzelhohe Data

机译:10个太阳循环突出的时间纬度分布:使用kodaikanal,meudon和kanzelhohe数据的研究

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Solar prominences are structures of importance because of their role in polar field reversal. We study the long‐term variation of the time latitude distribution of solar prominences in this article. To accomplish this, we primarily used the digitized disc‐blocked Ca?II?K spectroheliograms as recorded from Kodaikanal Solar Observatory for the period of 1906–2002. For improving the data statistics we included full disc H images from Meudon and Kanzelhohe Observatory, which are available after 1980. We developed an automated technique to identify the latitudinal locations of prominences in daily images from all three data sets. Derived time‐latitude distribution clearly depicted poleward migration of prominence structures for 10 cycles (15–24). Unlike previous studies, we separated the rate of poleward migration during onset and near pole, using piece‐wise linear fits. In most cases, we found acceleration in poleward migration with the change occurring near 70° latitudes. The derived migration rates for such large number of solar cycles can provide important inputs toward understanding polar field buildup process.
机译:太阳能突出是重要性,因为它们在极地领域逆转中的作用。我们研究了本文中太阳能突出时间纬度分布的长期变化。为实现这一点,我们主要使用数字化的盘块封闭的CA?II?K分光镜,从Kodaikanal太阳天文台记录在1906 - 2002期间。为了改进数据统计信息,我们包括来自Meudon和Kanzelhohohe天文台的全光盘H图像,该天文台可在1980年之后获得。我们开发了一种自动化的技术,以识别来自所有三个数据集的日常图像中的突出突出位置。衍生的时间 - 纬度分布清楚地描绘了10个循环的突出结构的极向迁移(15-24)。与以往的研究不同,我们在发作期间和接近杆子期间的极向迁移速率,使用碎片线性配合。在大多数情况下,我们发现极端迁移的加速度,随着近70°纬度而发生的变化。这么大量的太阳循环的派生迁移率可以为了解理解极地油田积累过程提供重要的输入。

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