地磁場における変動の統計モデル,古代時代の変動から逆転までの地磁場変動
1Laboratoire de Tectonique et Geophysique, Unite Associee au CNRS case 060, Universite de Montpellier 2, Place Eugene Bataillon, 34095 Montpellier Cedex 5, France.
Science (New York, N.Y.)
|August 9, 1996
まとめ
地球の磁場変動は,古世間の変化,遠征,逆転の間に分析されています. セキュラー変動の大きさは,軸対極モメントとは無関係であり,逆転の間は一定である.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- パレオマグネティズム (古磁気学) とは
- 地球科学 地球科学 地球科学
背景:
- 地球の磁場変動を理解することは,古磁気学の研究にとって極めて重要です.
- 古代の変形,遠征,逆転は,地力学への洞察を提供します.
研究 の 目的:
- 古代時代の変動,遠征,逆転時の地球の局所磁場を統計的に特徴づけること.
- 二極と世俗的な変動コンポーネントを使用して地磁気変動をモデル化します.
主な方法:
- 過去2000万年の2741の洗浄された溶岩流記録 (平均方向,残留強度) のデータベースの分析.
- 正常分布の軸性二極とマクスウェル分布の世俗的変数ベクトルを含む統計モデルの開発.
主要な成果:
- モデルは,方向と強度の両方で観測された地磁気変動の範囲に正確に適合します.
- セキュラー変動ベクトルの大きさは,地球の軸対極モメントの大きさに無関係です.
- 地磁気反転の間,世俗的な変動の振幅は変わらない.
結論:
- 地球の磁場は,異なる時間スケールと行動 (世俗的変動,遠征,逆転) において一貫した統計的特性を示しています.
- 提案されたモデルは,地磁場動態を理解するための堅牢な枠組みを提供します.
- セキュラー・バリエーションは,主二極場強度から独立して,古磁気学の基本的プロセスである.
さらに関連する動画
10:46A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data
Published on: December 9, 2015
10.9K
11:04Geomagnetic Field Gmf and Plant Evolution: Investigating the Effects of Gmf Reversal on Arabidopsis thaliana Development and Gene Expression
Published on: November 30, 2015
13.9K
関連する概念動画
01:19Magnetic Declination
313
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...
313
01:27Magnetic Fields
7.0K
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...
7.0K
01:28Magnetostatic Boundary Conditions
1.5K
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...
1.5K
01:11Atomic Nuclei: Larmor Precession Frequency
2.5K
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
2.5K
01:31Magnetic Susceptibility and Permeability
2.1K
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
2.1K
01:23Magnetic Field due to Moving Charges
11.3K
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
11.3K