太阳黑子本影振荡的周期测量

Period Measurement of the Umbral Oscillation in the Sunspot NOAA10593

本影振荡是出现在太阳黑子内的一种常见现象,精确测定它们的振荡周期对于理解黑子的结构和演化有着重要意义。应用快速傅里叶变换方法对空间望远镜HINODE在2007年5月1日观测的活动区AR10953内的黑子本影数据进行了细致的分析,结果发现在该活动区本影内存在一种典型的3 min振荡,其振荡周期约为154 s。

Umbral oscillations are a type of fundamental phenomena occurring in sunspots. Accurate measurement of umbral oscillation period is important to the understanding of the structure and evolution of sunspots. A high-quality observation of the sunspot within the active region AR10593 was carried out by the spacecraft HINDOE in May 1, 2007 at the Ca II line. By using the Fast Furiour Transformation （FFT）, we derive the oscillation period of the sunspot to be about 154 s, which means the umbral oscillation in the Ca II line formation region is a typical 3 min oscillation.