Study of paleosecular variation in association with dynamics of the Earth's deep interior based on dynamo theory
| Project/Area Number |
15K05270
|
|---|
| 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 | Kyushu University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2015-04-01 – 2018-03-31
|
| Project Status |
Completed (Fiscal Year 2017)
|
| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
|
|---|
| Keywords | 地球ダイナモ / コア / 地磁気永年変化 / 安定成層 / 逆転頻度 / 地球磁場 / 逆転 / ダイナモ / 数値シミュレーション / 地磁気 / 永年変化 |
|---|
| Outline of Final Research Achievements |
We have studied long-term/short-term geomagnetic secular variation using numerical models of MHD dynamo. Concerning thickness of a stably stratified layer beneath the core-mantle boundary, a thinner stably stratified layer is preferred to that with seismically inferred thickness, because strong attenuation of the magnetic field intensity and its secular variation through the layer is observed in numerical models. Parameter values of a paleosecular variation model derived from dynamo models show a trend similar to paleomagnetic data in spite of difference in its absolute values. The results suggest a common core dynamics in both numerical dynamos and the geodynamo determining a long-term trend such as polarity reversal frequency.
|
Report
(4 results)
Research Products
(22 results)
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
[Book] 系外惑星の事典2016
Author(s)
井田茂、田村元秀、生駒大洋、関根康人 (編集)
Total Pages
351
Publisher
朝倉書店
Related Report
-
