关键词: 弧状极光序列, 环形局部方向模式（RLDP）, 自动调节谱聚类（STSC）

Abstract: Arc aurora is an important form of dayside aurora. Its distribution and occurrence reveals magnetospheric pulsation of geomagnetic activity. It can help people to study the physical occurring mechanisms of arc aurora by the research on the occurrence time of arc aurora. According to the characteristics of arc aurora sequence, this paper proposes a new feature extraction method based on RLDP (ring local directional pattern), and gets the starting and ending time of aurora sequence by using the STSC (self-tuning spectral clustering). Compared with the image sequences labeled by manual, the experimental results show that the proposed method has better performance both on recall rate and precision rate.

Key words: arc aurora sequence, ring local directional pattern (RLDP), self-tuning spectral clustering (STSC)