• I. Cosmic Rays and the Interstellar Medium.- A Brief Introduction to the Cosmic Radiation.- The Composition of the Cosmic Rays: An Update.- Interstellar Dust-Gas Relationships.- Dust, Gas and Cosmic Rays in the Interstellar Medium.- Comparison Between Greenberg and Mathis Models of Grains for the H2 Formation Induced by Cosmic Rays.- II. Supernovae, Acceleration, Propagation and Source Composition.- Shock Acceleration of Cosmic Rays.- Source Composition, Sites of Origin And Acceleration of Cosmic Rays.- Cosmic-Ray Age and the Interstellar Medium.- The Production of Antiprotons in the Interstellar Gas by Propagating Cosmic Rays.- The Source Composition of Galactic Cosmic Rays and the Condensation Process of the Elements in Circumstellar and Interstellar Gases.- The Distribution of Supernova Remnants in the Galaxy.- Gamma Rays from Supernova 1987A.- Acceleration of Cosmic Rays at Young Supernova Remnants.- The Effect of Relativistic Particle Beams on the Evolution of Supernova Envelopes: Self-Consistent Solutions.- Radio Spectral Variations in the Cygnus Loop.- III. Gamma Rays and Their Role as Cosmic Ray Tracers.- Gamma Ray Astrophysics at Energies up to 10 Gev.- Vhe and UHE Gamma Ray Sources.- Gamma-Rays from Electron, Proton Beam Interactions with Matter and/or Radiation: Application to Cygx-L, Geminga, and 3C273.- Gamma Rays and Neutrinos from Accretion Processes onto Collapsed Objects: Application to 3C273.- Nearby Galaxies in Highenergy Gamma Rays.- IV. Ultra-Energetic Cosmic Nuclei.- Cosmic Rays at the Highest Energies.- Participants.- Author Index.

The book provides a useful introduction to the study of the aurora for the nonexpert reader. It should be particularly helpful to amateur astronomers and others who wish to make systematic observations of the aurora from the UK. Much background information on the solar-terrestrial environment has been included which provides a helpful insight into the auroral processes. The Observatory