| Budget Amount *help |
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Outline of Final Research Achievements |
We performed numerical geodynamo simulations including rotational speed variation associated with climatic changes with ice and non-ice ages, and studied the effect of rotational speed variation on the core convection and geodynamo. We focused on the variation of about twenty thousand years (which is the magnetic diffusion time and nearly equal to one of the Milankovitch cycle). The magnetic field variation is caused by it, and we also found the process of the magnetic field variation. The Joule heating is important for the magnetic field variation. Also we found that the heat flux at the core-mantle boundary changes by rotational speed variation.
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