As a study group connecting artificial sun research and solar research, we held the “Hinode Laboratory Study Group” online at the end of this year as well. In collaboration with laboratory experiments, Ono, Hinode Taiyo observation, Shimizu, and Hara, theoretical simulations, Horiuchi et al., Lively discussions centered on comparisons between observations and experiments, from local phenomena to macroscopic structural changes. It was. In particular, the magnetic reconnection phenomenon that produces extremely large plasma heating is one of the focal points, and research is rapidly expanding from space and solar plasma to fusion plasma. Laboratory experiment, solar / magnetosphere / space observation, theory / simulation collaborate, experiment: Ono, I, Tanabe, theory / simulation: Cheng, Horiuchi, Usami, solar observation: Shimizu, Hara et al. In addition, oral presentations were made by students. One of the topics is the magnetic structure in the sheet current called plasmoids, magnetic islands, or blobs. If you look at the current sheet of magnetic reconnection formed by the explosion phenomenon called solar flare with an ultraviolet image (observation: Takasato et al.), You can see the structure of fine lumps (blobs) as shown in the figure on the left. In the tokamak plasma coalescence experiment for artificial sun research (measurement: Akimitsu et al.), It has become clear that a mass of current density can be seen in the current sheet formed on the coalescing surface as shown in the figure on the right. This mass of current density is a so-called magnetic island (plasmoid) with a closed magnetic surface, and when these are split and coalesced and finally released, magnetic reconnection proceeds at once, the magnetic field structure changes significantly, and it is large. It has become clear that plasma heating can be obtained.
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