利用Kodaikanal、Meudon和Kanzelhohe资料研究10个太阳活动周日珥的时纬分布
Time-Latitude Distribution of Prominences for 10 Solar Cycles: A study using Kodaikanal, Meudon and Kanzelhohe Data
摘要：
太阳磁场是重要的结构，因为它们在极场反转中起作用。本文研究了太阳辐射时纬分布的长期变化。为了实现这一目标，我们主要使用了Kodaikanal太阳天文台在1906 - 2002年期间记录的数字化圆盘阻挡Ca II K光谱。为了改进数据统计，我们包括了Meudon和Kanzelhohe天文台1980年以后提供的全盘H_alpha图像。我们开发了一种自动化的技术来识别所有三个数据集的日常图像中的纬度位置。导出的时纬分布清晰地描述了10个周期（15-24）日珥结构的向极迁移。与以往的研究不同，我们使用分段线性拟合分离了在起始和接近极点期间向极点迁移的速率。在大多数情况下，我们发现向极迁移的加速，变化发生在+/- 70度纬度附近。推导出的迁移率，这样大量的太阳活动周期可以提供重要的投入，了解极场的建立过程。
英文摘要：
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 digitised 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_alpha 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 datasets. Derived time-latitude distribution clearly depicted pole-ward migration of prominence structures for 10 cycles (15-24). Unlike previous studies, we separated the rate of pole-ward migration during on-set and near pole, using piece-wise linear fits. In most cases, we found acceleration in pole-ward migration with the change occurring near +/- 70 degree latitudes. The derived migration rates for such large number of solar cycles can provide important inputs towards understanding polar field build-up process.
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