Colloquium on Oct. 23, 2025

Emission dimmings associated with solar eruptions in the meter and decimeter wavebands

Speaker: Zhenyong Hou (PKU)

Venue: SWIFAR Building 2111

Time: 16:00 PM, Thursday, Oct. 23, 2025

Abstract:

Energetic eruptive phenomena such as flares and coronal mass ejections (CMEs) frequently occur on the Sun, which are characterized not only by enhanced emission but also by accompanying dimming effects. The DAocheng solar Radio Telescope (DART) has detected our Sun for over a year, providing high-quality radio imaging and spectral data for both solar eruption research and space weather monitoring and forecasting. Using coordinated observations from both domestic and international solar instruments, we have conducted detailed investigations on radio dimming phenomena associated with filament eruptions. Our work has analyzed the evolution of the radio dimming and its relationships with frequency and filament area. Our results suggest a novel methodology for detecting filament eruptions and CMEs on exoplanetary host stars through radio observations. Furthermore, we have examined the manifestation of coronal dimming in radio wavelengths and attempted to diagnose the density changes using DART data, thereby enabling estimations of CME mass.