関連する実験動画
Updated: May 2, 2026

06:42
Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
9.2K
潮の消散と地球の内部磁場の強さ
1Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA. bbuffett@berkeley.edu
Nature
|December 18, 2010
まとめ
この研究は,潮分散測定を用いて地球の内部磁場強さを推定しています. 2.5ミリテスラ (mT) のコア平均フィールドは,地球のニュテーションにおける観測された異常を説明し,ジオダイナモの電力要求を制限します.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 地球科学 地球科学 地球科学
- ダイナモ理論とは
背景:
- 地球の表面の磁場は,内核の磁場の一部である.
- ジオダイナモを理解するには,内部磁場の強さと構造の知識が必要です.
- 潮分散は,内部の中核状態を調査するための間接的な方法を提供します.
研究 の 目的:
- 地球の内部磁場の強さを推定する.
- 地球のニュートーションで観察された異常な消散を説明するために.
- ジオダイナモの電力要求を制限するために.
主な方法:
- 潮分散の測定を用いて.
- 地球の液体コアにおける潮による流体の流れを分析する.
- 地球のニュテーションにおけるオームの損失とそのシグネチャーを調査する.
主要な成果:
- ニュテーションの異常な消散は,コアの平均磁場2.5ミリテスラ (mT) によって説明されます.
- このフィールド強さは,高流体粘度またはより強い内核境界フィールドの必要性を排除します.
- この発見は,ジオダイナモの動力に対する重要な制約を提供する.
結論:
- この研究は,間接的に地球の内部磁場強さを成功裏に推定しています.
- 観測された潮分散の異常は,2.5 mTのコアフィールドと一致しています.
- これらの結果は,ジオダイナモとそのエネルギー源についての理解を深める.
関連する概念動画
Tidal Forces
2.9K
The origin of Earth's ocean tides has been a subject of continuous investigation for over 2000 years. However, the work of Newton is considered to be the beginning of the proper understanding of the phenomenon. Ocean tides are the result of gravitational tidal forces. These same tidal forces are present in any astronomical body; they are responsible for the internal heat that creates the volcanic activity on Io, one of Jupiter's moons, and the breakup of stars that get too close to...
2.9K
Magnetic Fields
6.0K
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
A magnetic field is defined by the force that a charged particle experiences...
6.0K
Divergence and Curl of Magnetic Field
4.5K
The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
4.5K
Magnetostatic Boundary Conditions
1.9K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
1.9K
Magnetic Damping
1.3K
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
1.3K
Magnetic Declination
789
Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...
789

