Solar Flares: Magnetohydrodynamic Processes
スポンサーリンク
概要
- 論文の詳細を見る
This paper outlines the current understanding of solar flares, mainly focused on magnetohydrodynamic (MHD) processes responsible for producing a flare. Observations show that flares are one of the most explosive phenomena in the atmosphere of the Sun, releasing a huge amount of energy up to about 10^32 erg on the timescale of hours. Flares involve the heating of plasma, mass ejection, and particle acceleration that generates high-energy particles. The key physical processes for producing a flare are: the emergence of magnetic field from the solar interior to the solar atmosphere (flux emergence), local enhancement of electric current in the corona (formation of a current sheet), and rapid dissipation of electric current (magnetic reconnection) that causes shock heating, mass ejection, and particle acceleration. The evolution toward the onset of a flare is rather quasi-static when free energy is accumulated in the form of coronal electric current (field-aligned current, more precisely), while the dissipation of coronal current proceeds rapidly, producing various dynamic events that affect lower atmospheres such as the chromosphere and photosphere. Flares manifest such rapid dissipation of coronal current, and their theoretical modeling has been developed in accordance with observations, in which numerical simulations proved to be a strong tool reproducing the time-dependent, nonlinear evolution of a flare. We review the models proposed to explain the physical mechanism of flares, giving an comprehensive explanation of the key processes mentioned above. We start with basic properties of flares, then go into the details of energy build-up, release and transport in flares where magnetic reconnection works as the central engine to produce a flare.
- 2011-12-15
論文 | ランダム
- 7179 公営住宅建替事業にみられる居住者住要求の組織化に関する研究 : 交渉による要求具体化プロセスにおける居住者組織の諸側面
- 7157 居住地の変動と安定に関する考察 : その1 : ブライテッド・エリアの追跡調査から
- 8008 公営住宅建替事業にみる居住者住要求の組織化に関する研究 : その2 交渉過程にみる要求具体化プロセスの分析(建築経済・住宅問題)
- 8007 公営住宅建替事業にみる居住者住要求の組織化に関する研究 : その1 問題の所在および研究の方法(建築経済・住宅問題)
- 7046 居住地の変動と安定に関する考察 : その1:ブライテッド・エリアの追跡調査から(都市計画)