太陽光超粒子の波のような性質
1W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, California 94305, USA. lgizon@solar.stanford.edu
Nature
|January 4, 2003
まとめ
太陽の超粒子は振動と波を示し,より速い見かけの回転を説明します. この発見は,太陽の表面の磁場とプラズマの動きのダイナミクスに光を当てています.
科学分野:
- 太陽物理 太陽物理学
- ヘリオフィジックス ヘリオフィジックス
- プラズマ物理学のプラズマ物理学
背景:
- スーパーグラニュレーションは,水平の流出と磁場濃度によって特徴づけられる太陽表面ダイナミクスの重要な特徴です.
- 基礎となるコンベクティブプロセスと,スーパーグラニュレーションの表面的な超回転は,太陽の乱流のために,まだ十分に理解されていません.
- 既存のモデルは,スーパーグラヌレーションパターンと磁気特性の間の観測された回転不一致を説明するために苦労しています.
研究 の 目的:
- 太陽超粒子の動態を調査するために.
- 磁気特性に比べると,スーパーグラヌレーションパターンの観測されたより速い回転を説明するために.
- スーパーグラニュレーションに存在する波現象を理解するために.
主な方法:
- 太陽の表面現象の観測分析.
- スーパーグラニュレーション内の振動と波の伝播の分析.
- パターンの回転とプラズマと磁場運動の比較.
主要な成果:
- スーパーグラニュレーションは6~9日の周期で振動を示します.
- これらの振動は,主にプログレイド波を支えている.
- 観測されたプログラード波は,スーパーグラヌレーションパターンの明らかな超回転を説明する.
- プラズマの回転は,磁気網の運動と一致しています.
結論:
- 太陽の超粒化は静的ではなく動的であり,波現象を特徴としています.
- プログレード波は,表面上の超回転の物理的な説明を提供する.
- この発見は,スーパーグラヌレーションパターンの回転速度と磁気特性を調和させ,太陽のコンベクションの理解を深める.
関連する概念動画
Interference and Superposition of Waves
7.5K
When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
7.5K
The de Broglie Wavelength
34.7K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
34.7K
Standing Electromagnetic Waves
2.5K
Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
2.5K
The Principle of Superposition and the Gravitational Field
2.3K
The principle of superposition applies to gravitational forces of objects that are sufficiently far apart. It states that the net gravitational force on a point object is the vector sum of the gravitational forces on it due to various objects. The principle helps calculate the force by listing the individual forces and then vectorially summing them up. However, it should be noted that the principle of superposition is not always apparent. In the presence of a second force, the first force could...
2.3K
Momentum And Radiation Pressure
2.6K
An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container.
2.6K
Standing Waves in a Cavity
1.6K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.6K


