[A-OS10] Continental Oceanic Mutual Interaction - Planetary Scale Material Circulationn

[AOS10-P05] Characteristics of the filament eruption event on August 9, 2016 with CME using Hα Doppler velocity field analysis.

*Nami Kimura¹, Ayumi Asai², Kenichi Otsuji³, Yosuke Alexandre Yamashiki⁴ (1.Kyoto University, 2.Astronomical Observatory, Kyoto University, 3.National Institute of Information and Communications Technology, 4.Graduate School of Advanced Integrated Studies in Human Survivability, Kyoto University, Japan)

Keywords:Sun, filaments, prominences, flares, coronal mass ejections(CMEs)

Space weather refers to environmental changes in the space around the Earth caused by solar activity and other factors. Space weather forecasting is important because solar surface explosions (flares) and eruptions can cause magnetic storms and increased radiation in the Earth's environment, which can have a serious impact on human social activities. In particular, eruptions of cold plasma (filament/prominences) floating by magnetic force in the solar corona are often accompanied by coronal mass ejections (CMEs), in which a large amount of solar plasma is ejected into interplanetary space, and are said to be one of the causes of magnetic storms. In many cases, CMEs are observed after filamentary eruptions, and statistical analysis has shown that there is a high correlation between the two phenomena. However, the process of the transition from filament eruptions to CME cannot be directly observed due to gaps in the field of view, and has not yet been clarified. In this study, we used the Solar Dynamics Doppler Imager (SDDI) onboard the Solar Magnetic Activity Research Telescope (SMART) at Kyoto University's Hida Observatory to investigate the relationship between these phenomena. We studied in detail the filamentary eruption and associated CME that occurred near the northeastern limb of the Sun from 23:30 on August 9, 2016 to 3:30 on August 10, 2016. The filament is known to have generated a large CME (370 km/s) at 4:00 UTC on August 10, 2016 after the eruption. In particular, from SMART/SDDI observations at 73 wavelengths in the ±9° A range centered on the Hα line, we derived the line-of-sight velocity of the filament by adapting the "cloud model" of Beckers [Beckers 1964, 1979], and the 3-dimensional velocity field of the filament was derived by combining its line-of-sight velocity and the apparent motion. The vertical motion of the filament was investigated by creating a time slice image along a slit placed vertically near the center of its arch-like structure. This revealed a rotational motion inside the filament, and this rotational motion was spatially and temporally related to the later CME. We also focused on each plasma blobs inside the filament and followed the time variation of the velocity in the direction of the line of sight and the direction perpendicular to the line of sight to investigate the change in the structure of the filament before and after the eruption in detail.