Shin TORIUMI

Graduated from the School of Science, the University of Tokyo (PhD in Science, March 2014), Shin Toriumi has been working on the formation of sunspots and genesis of solar flares through both numerical simulations and observational data analysis. He is also interested in stellar activity phenomena. ADS Google Scholar ORCID

• Magnetic flux emergence and sunspot formation: Sunspots are created through emergence of magnetic fields from the solar interior, which cannot be investigated by direct optical observations. Toriumi performed large-scale numerical simulations and revealed the physical properties of emerging magnetic fields such as a rising speed and magentic structure. He also developed a new method of probing subsurface magnetic fields using helioseismology and estimated the emergence speed, which was in accordance with the numerical result.
• Sunspot jets and explosions: Sunspots harbor a variety of activity events like jets and explosions. He analyzed the observational data from Hinode and IRIS and numerical model of sunspots, revealing that the sunspots jets are caused by magnetic reconnection, driven by turbulent convection. → NAOJ press release
• Flare-producing sunspots: Major solar flares tend to occur in complex-shaped sunspot groups. Toriumi analyzed a number of flare-producing sunspots and revealed their statistical properties. He also succeeded in the first-ever modling of spontaneous generation of flaring sunspots via realistic simulation of magnetic flux emergence. → HMI Nuggets Web release
• Solar-Stellar connections: To see what starspots would look like, Toriumi surveyed sun-as-a-star light curves of sunspot transit events for a variety of wavelengths and explored the ways to characterize the magnetic and thermal circumstances of starspots.→ NASA press release He also revealed that ultra-hot atmospheres of the Sun and Sun-like stars are produced by the common heating mechanisms.→ American Univ press release
• SOLAR-C: With the target launch in mid-2020s, Japan's next-generation solar-observing satellite SOLAR-C is now in Phase A (Phase B in the US). Toriumi is involved in the definition of science objectives as well as development of science operation, data processing, and data analysis.