ソーラースピキュールとアルフェニック波の発生について
J Martínez-Sykora1,2, B De Pontieu2,3, V H Hansteen3,2
1Bay Area Environmental Research Institute, Petaluma, CA 94952, USA. juanms@lmsal.com.
Science (New York, N.Y.)
|June 24, 2017
まとめ
太陽の染色体内のジェットです イオン中性相互作用によって増幅される磁気圧が これらのジェットを駆動し コロナを熱し 波を生成します
科学分野:
- 太陽物理学
- プラズマ物理学
- マグネトヒドロダイナミック
背景:
- 太陽の染色体には スピキュールと呼ばれるジェットがあり プラズマを高速度でコロナに押し込みます
- 冠状熱と太陽風発電におけるスピキュルの起源と役割は,まだ十分に理解されていません.
研究 の 目的:
- 太陽のスパイクルを駆動する物理的メカニズムを調査する.
- スピキュール形成の理論モデルと観測データを接続する.
主な方法:
- マグネトヒドロダイナミック (MHD) シミュレーションと,インターフェース・リージョン・イマージング・スペクトログラフ (IRIS) とスウェーデン1m太陽望遠鏡 (SST) の観測データとの比較.
主要な成果:
- 磁気張力の増幅と上向きの輸送から発生します.
- この増幅はイオン中性相互作用または二極拡散によって起こる.
- 磁気圧の衝動的な放出は プラズマの流れを駆動し,プラズマを熱し,アルフェニック波を生成します.
結論:
- アンビポラー拡散と磁気張りは,スパイキュルの形成と進化の重要なメカニズムです.
- スピキュールは太陽の染色体からコロナにエネルギーとモメンタムを転送する上で重要な役割を果たします.
- この発見により,スピキュールの動態と,冠状熱と太陽風への貢献がより明確に理解できます.
関連する概念動画
01:10Generating Electromagnetic Radiations
7.7K
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
7.7K
01:07Propagation of Waves
3.1K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
3.1K
01:15Van de Graaff Generator
2.6K
Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
2.6K
01:30Electromagnetic Waves
11.7K
James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
11.7K
01:15Standing Electromagnetic Waves
2.4K
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...
2.4K
01:29Plane Electromagnetic Waves II
4.2K
Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
4.2K