STATISTICAL STUDY ON PERSONAL REDUCTION COEFFICIENTS OF SUNSPOT NUMBERS SINCE 1981

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
I. Cho, S. Bong, Kyungsuk Cho, Jaejin Lee, R. Kim, Young-deuk Park, Yeon-Han Kim
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引用次数: 2

Abstract

Using sunspot number data from 270 historical stations for the period 1981-2013, we investigate their personal reduction coefficients (k) statistically. Chang & Oh (2012) perform a simulation showing that the k varies with the solar cycle. We try to verify their results using observational data. For this, a weighted mean and weighted standard deviation of monthly sunspot number are used to estimate the error from observed data. We find that the observed error (noise) is much smaller than that used in the simulation. Thus no distinct k-variation with the solar cycle is observed contrary to the simulation. In addition, the probability distribution of k is determined to be non-Gaussian with a fat-tail on the right side. This result implies that the relative sunspot number after 1981 might be overestimated since the mean value of k is less than that of the Gaussian distribution.
1981年以来太阳黑子数个人约简系数的统计研究
利用1981—2013年270个历史站点的太阳黑子数数据,对黑子的个人缩减系数(k)进行了统计研究。Chang & Oh(2012)的模拟表明,k随太阳周期的变化而变化。我们试图用观测数据来验证他们的结果。为此,利用月黑子数的加权平均值和加权标准差来估计观测资料的误差。我们发现观测到的误差(噪声)比模拟中使用的小得多。因此,没有观测到与模拟相反的太阳周期的明显k变化。此外,确定k的概率分布为非高斯分布,右侧有一条肥尾。这一结果表明,由于k的平均值小于高斯分布的平均值,1981年后的相对太阳黑子数可能被高估了。
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来源期刊
Journal of the Korean Astronomical Society
Journal of the Korean Astronomical Society 地学天文-天文与天体物理
CiteScore
1.30
自引率
10.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.
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