JMLAB

AICS Cafe on 7th Jan, invited by Makino-team

• date:　21 Jan 2016 (Thu) 14:00-15:30
• Place: Auditorium, 6th floor, AICS
• Speaker: Hideyuki Hotta(Chiba U.)
• Title:　Numerical challenge to sunspot 11-year cycle
• Abstract: The sun is a magnetized star. We can frequently observe sunspot, i.e., strong magnetic region, on the solar surface. The magnetic field is thought to be generated in the solar interior by dynamo action of turbulent ionized plasma. The number of sunspot has a long-standing big mystery, i.e., 11-year cycle. We have not understood what makes this beautiful cycle. The key is the turbulent thermal convection in the solar convection zone. The turbulence, however, is nonlinear and complicated, and investigations by numerical calculation have important roles. Since we had problems on using large supercomputers and increasing resolution, we newly adopt a method so called, the Reduced Speed of Sound Technique (RSST) which can solve our previous problems. Using this method we have significantly improved our understanding of turbulent flow and magnetic field in the solar interior. In the talk, one example, the small-scale effect for constructing the large-scale magnetic field is shown.
• Please visit AICS Cafe Official Page: http://www.aics.riken.jp/en/outreach/aics-cafe/