太阳物理研究组知识库

本文对土耳其国立Tubitak天文台观测的2001年3月到2007年8月期间的每月平均太阳半径值进行集合经验模式分解分析来研究太阳半径的变化特征.太阳半径在年际尺度上的短期变化可能和太阳强磁活动没有关联,在活动周尺度上的变化和强磁活动存在非常强的反相关关系.太阳半径在活动周的下降期的年变化率为0.0427?/年,在活动周尺度上的相对变化估计为0.036%,变化幅度可达0.3544?.

Monthly mean values of solar radius measured at the Tubitak National Observatory, Turkey during the interval of March 2001 to August 2007 have been utilized to investigate variation of solar radius at the scale of solar cycle through the Ensemble Empirical Mode Decomposition analysis. Variation of solar radius at the short-term scale of years is found to have little statistical relation with the strong magnetic field activity of the Sun. But at the long-term scale of a solar cycle, variation of solar radius statistically displays a strong negative correlation with sunspot number. Variation of solar radius is about 0.0427/year, averaged over the descending period of a solar cycle, and reaches about 0.3544 within a solar cycle, namely about 0.036% in the amplitude variation of solar radius within a solar cycle.