Heterogeneity at the bottom of the mantle and geomagnetic non-dipole field
Project/Area Number |
23540491
|
Research Category |
Grant-in-Aid for Scientific Research (C)
|
Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Solid earth and planetary physics
|
Research Institution | The University of Tokyo |
Principal Investigator |
|
Project Period (FY) |
2011-04-28 – 2015-03-31
|
Project Status |
Completed (Fiscal Year 2014)
|
Budget Amount *help |
¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
|
Keywords | 地磁気 / 核ーマントル境界 / 電気伝導度 / 地球中心核 / マントル電気伝導度 / 地磁気変動 / ダイナモ理論 |
Outline of Final Research Achievements |
In case that the heterogeneous mantle electrical conductivity and simple magnetic field at the core-mantle boundary are the cause of the vertical magnetic field component at the equatorial region, it is essential for the simple magnetic field to contain the toroidal magnetic field component. The heterogeneous mantle converts the toroidal magnetic field at the core-mantle boundary to an observable magnetic field at the Earth’s surface. Detection of the magnetic field and accompanying electric field variation enables us to constrain the electrical conductivity of the heterogeneous block at the bottom of the mantle.
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Report
(5 results)
Research Products
(10 results)