Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

M (Multidisciplinary and Interdisciplinary) » M-GI General Geosciences, Information Geosciences & Simulations

[M-GI28] Development of computational sciences on planetary formation, evolution and surface environment

Wed. May 23, 2018 9:00 AM - 10:30 AM A03 (Tokyo Bay Makuhari Hall)

convener:Yoshi-Yuki Hayashi(Department of Planetology/CPS, Graduate School of Science, Kobe University), Masaki Ogawa(Division of General Systems Studies, Graduate School of Arts and Sciences, University of Tokyo), Shigeru Ida(東京工業大学地球生命研究所, 共同), Kanya Kusano(Institute for Space-Earth Environmental Research, Nagoya University), Chairperson:Kominami Junko(東京工業大学 地球生命研究所)

9:00 AM - 9:15 AM

[MGI28-01] First comprehensive calculation of the sun from the base of the convection zone to the lower chromosphere

*Hideyuki Hotta1, Haruhisa Iijima2, Kanya Kusano2 (1.Graduate School of Science, Chiba University, 2.Institute for Space-Earth Environmental Research, Nagoya University)

Keywords:Sun, Convection

We carry out a comprehensive calculation from the base of the convection zone to the lower chromosphere of the sun for the first time.
The solar convection zone is stratified significantly. The density at the base of the convection zone is one million times larger than that at the photosphere (surface). This causes significant spatial and temporal scale separations between these regions. For example, the time scales are minutes and month at the base and the surface, respectively. We thus need to investigate these region separately so far.
In terms of the sunspot creation, however, it is inevitable to cover the whole convection zone in one calculation, since strong magnetic field for the sunspots is thought to be generated around the base of the convection zone by dynamo action and the sunspots are emerged with radiative cooling at the surface.
For years, we carefully prepare methods for covering the whole convection zone, the reduced speed of sound technique, the equation of state, the radiation transfer and so on. Finally, we succeed in covering the whole convection zone in a calculation. We report method and results of this state-of-the-art calculation in the presentation.