Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

Magnetic Fields01:27

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...
6.0K
Diamagnetism01:26

Diamagnetism

2.8K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.8K
Faraday Disk Dynamo01:23

Faraday Disk Dynamo

3.9K
A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
3.9K
Energy In A Magnetic Field01:24

Energy In A Magnetic Field

1.6K
If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus...
1.6K
Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

5.6K
A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...
5.6K
DC Generator01:19

DC Generator

2.7K
An alternator converts mechanical energy into electrical energy that varies sinusoidally, resulting in AC current. Meanwhile, a DC generator converts mechanical energy into electrical energy, which are DC pulses with the same polarity. The construction of a DC generator is similar to that of an alternator, except that the pair of slip rings is replaced by a single split ring, also called a commutator. The commutator functions like a periodic rotary switch; it changes the contacts with the...
2.7K

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Quenching of zonal winds in Jupiter's interior.

Proceedings of the National Academy of Sciences of the United States of America·2024
Same author

Approaching a realistic force balance in geodynamo simulations.

Proceedings of the National Academy of Sciences of the United States of America·2016
Same author

Energy flux determines magnetic field strength of planets and stars.

Nature·2009
Same author

Earth science: a sheet-metal geodynamo.

Nature·2008
Same author

Power requirement of the geodynamo from ohmic losses in numerical and laboratory dynamos.

Nature·2004

関連する実験動画

Updated: May 5, 2026

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
11:47

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

8.6K

水星の磁場を生成する深層ダイナモ.

Ulrich R Christensen1

  • 1Max-Planck Institute for Solar System Research, Max-Planck-Strasse 2, 37191 Katlenburg-Lindau, Germany. christensen@mps.mpg.de

Nature
|December 22, 2006
PubMed
まとめ

水星の弱い磁場は,新しいダイナモモデルによって説明されています. このモデルは,コア固化によって駆動され,深さで強いフィールドを生成し,表面に到達する構成要素は徐々にしかありません.

科学分野:

  • 惑星科学は惑星科学である.
  • 地質物理学 地質物理学とは地質物理学です.
  • マグネトヒドロダイナミクス

背景:

  • 水星には,地球規模の磁場があり,その磁場は,その流体鉄の核にあるダイナモによって生成される可能性が高い.
  • フィールドの低強度 (地球の1%) は,はるかに強いフィールドを予測する従来のダイナモモデルに挑戦しています.

研究 の 目的:

  • 水星の観測された磁場強度と構造を説明する数値ダイナモモデルを提示する.
  • 水銀の予想と観測された磁場強度の間の不一致を調和させるため.

主な方法:

  • 内核の固化に関連した熱組成的コンベクションによって駆動されるダイナモをシミュレートする数値モデルを開発した.
  • 核-マントルの境界にサブアディアバティック熱グラデントを組み込み,外核の安定した層化を導いた.

主要な成果:

  • モデルは,コンベクションが発生するコアの奥深くに強い磁場を生成します.
  • 水銀のゆっくりとした回転は,小規模で急速に変動する構成要素が支配するフィールドをもたらします.
  • 安定した,導電性外部のコア領域は,皮膚効果によって急速に変化するフィールドコンポーネントを弱め,二極と四極のコンポーネントが持続することを可能にします.

さらに関連する動画

Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish
07:47

Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish

Published on: March 18, 2019

6.5K
Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

2.5K

関連する実験動画

Last Updated: May 5, 2026

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
11:47

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

8.6K
Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish
07:47

Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish

Published on: March 18, 2019

6.5K
Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

2.5K

結論:

  • 提案されたダイナモモデルは,水星の表面磁場の観測された構造と強さをうまく説明しています.
  • このモデルは,現在および将来の宇宙ミッションのために,水星の磁場の検証可能な特性を予測しています.