论文信息 - FERMI ACCELERATION OF SOLAR COSMIC RAYS

FERMI ACCELERATION OF SOLAR COSMIC RAYS

Fermi acceleration of solar relativistic protons has sometimes been discounted because ‘second order’ Fermi acceleration is inefficient and is considered to generate an energy-dependent spectrum, whereas the spectrums observed at the earth seem to show a greater simplicity when expressed in terms of rigidity [Webber, 1964]. A more efficient ‘first-order’ Fermi mechanism has been suggested recently [Wentzel, 1964a]. This note is to point out several features favoring Fermi acceleration. In particular, a great variety of energy- or rigidity-dependent spectrums can be generated by the Fermi mechanism, the spectral shape depending on the manner of escape from the region of acceleration.

D. Wentzel

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