Particle astronomy - the study of cosmic radiation - was the first of
the new astronomies to emerge in the twentieth cen- tury. Although
cosmic-ray phenomena have been fruitfully investi- gated for some
seventy years, the central engima - the origin of these high-energy
particles - remains a challenge. Among the ob- servational clues to
possible sites and mechanisms of cosmic-ray production, none carries
more information than the composition and energy distribution of the
particles arriving in the solar system. The present volume is the work
of many participants in a NATO Advanced Study Institute on "The
Composition and Origin of Cosmic Rays" held from the 20th to the 30th of
June, 1982 under the aus- pices of the Ettore Majorana Centre for
Scientific Culture. Par- ticipants came to the Centre in Erice, Sicily
from eight countries. This Institute was also the third Course of the
International School of Cosmic-Ray Astrophysics, which has been meeting
bienni- ally 1n Erice. Of the two previous Courses, likewise sponsored
by the Majorana Centre, the first (1978) provided a broad introduction
to th field. It was entitled "Progress and Problems in Cosmic- Ray
Physics." The second (1980) was devoted to "Acceleration of Particles in
Nature." It treated mechanisms of acceleration, some candidate sites,
and observational and theoretical constraints. Director of the Majorana
Centre is Prof. Antonino Zichichi.