Sources of quasi-periodic propagating disturbances above a solar polar coronal hole

Fang-Ran Jiao, Li-Dong Xia, Bo Li, Zheng-Hua Huang, Xing Li, Kalugodu Chandrashekhar, Chao-Zhou Mou, Hui Fu

Published 2015-07-30Version 1

Quasi-periodic propagating disturbances (PDs) are ubiquitous in polar coronal holes on the Sun. It remains unclear as to what generates PDs. In this work, we investigate how the PDs are generated in the solar atmosphere by analyzing a fourhour dataset taken by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO). We find convincing evidence that spicular activities in the solar transition region as seen in the AIA 304 {\AA} passband are responsible for PDs in the corona as revealed in the AIA 171 {\AA} images. We conclude that spicules are an important source that triggers coronal PDs.