9:23 AM - 9:45 AM
[PEM10-03] How To Trigger the Solar Flares?
★Invited Papers
Keywords:Solar flares, Coronal mass ejections, Magnetic fields
Solar flares and coronal mass ejections, the largest energy-releasing events in the current solar system, are an excellent manifestation of ceaseless magnetohydrodynamic activity of the Sun. In particular, the question of when the flares occur and how they are triggered is not only crucial from the viewpoint of scientific curiosity but also directly linked to the space-weather forecasting, which is now increasingly demanded in tandem with ever-growing reliance of the modern society on information technology. To challenge this conundrum, it is of paramount importance to leverage state-of-the-art observational capabilities, such as spectroscopy in a variety of wavelength domains and polarimetry to derive the detailed magnetic information, and combine the observables with cutting-edge theoretical models that allow for exploration of coronal evolutions including the nonlinear force-free field extrapolations. In the last decade, we have seen a substantial improvement in understanding of flare-triggering mechanisms, facilitated by the development in the realm of both observation and theory. In this review, we first provide an overview of the status quo of flare-related studies. Then, we cast a spotlight on recent advancements by presenting some of our achievements, focusing especially on the series of analysis of the representative flares in Cycle 24 that unveil the physical mechanisms behind the photospheric evolution of the triggering field and its atmospheric response. Finally, the review concludes with discussing the future perspective.