Speaker
Description
Large-scale coronal structures, such as streamers and pseudostreamers, are considered potential sources of the slow solar wind, contributing to its structured nature and variability. However, due to the lack of high-resolution coronal observations, the processes driving the dynamics of these structures and their role in the slow wind are not yet fully understood. In this study, we analyzed a pseudostreamer observed using the Full Sun Imager (FSI), with its footpoints captured by the High Resolution Imager (HRIEUV), offering a resolution of approximately 300 km. We identified the presence of propagating disturbances (PDs) near the footpoints, extending to heights of 50–60 Mm in several open strands. The projected velocities of these PDs ranged from 27 to 250 km/s, with an average of 121 km/s. Additionally, we identified distinct periodicities with significant power, specifically, 8.6, 9.2, and 16.5 minutes in these PDs. We also obtained faint signatures of flows in the FSI imaging time series. These PDs may play a role in transporting plasma to the outer corona, potentially contributing to the solar wind.
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