非表示:
キーワード:
Cosmic-rays. Magnetic-field. High-energy. Ultrarelativistic shocks. Nonlinear amplification. Radio. Waves. Injection. Radiation. Transport.
要旨:
In two seminal papers, Fermi outlined the stochastic theory of particle acceleration in astrophysical environments. Fifty years later, a direct descendant of this theory is still the favoured explanation for the problem which motivated Fermi-the acceleration of cosmic rays in our galaxy. More recently, the same basic ideas have been generalised to apply to situations involving relativistic motion, such as active galaxies and gamma-ray bursts. This paper presents Fermi's characteristically simple and powerful ideas, describes their generalisation and assesses their impact on the current status of our ideas concerning the origins of galactic cosmic rays and gamma-ray bursts.
