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Article
The Composition of Cosmic Rays and the Mixing of the Interstellar Medium
The differences between the composition of Galactic cosmic rays and that of the interstellar medium are manifold, and they contain a wealth of information about the varying processes that created them. These ...
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Chapter
The Composition of Cosmic Rays and the Mixing of the Interstellar Medium
The differences between the composition of Galactic cosmic rays and that of the interstellar medium are manifold, and they contain a wealth of information about the varying processes that created them. These ...
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Chapter
γ-Ray and Neutrino Astronomy
Important processes for continuum emission at γ-ray energies are bremsstrahlung, magneto-bremsstrahlung, and Compton scattering of blackbody radiation by energetic electrons and positrons [1–6].
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Article
Spallogenic Light Elements and Cosmic-ray Origin
We discuss the new information that the light elements, particularly Be, have brought to cosmic-ray studies, specifically to the issue of the origin of the seed material of the cosmic rays. The primary nature ...
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Chapter and Conference Paper
Spallogenic Light Elements and Cosmic-Ray Origin
We discuss the new information that the light elements, particularly Be, have brought to cosmic-ray studies, specifically to the issue of the origin of the seed material of the cosmic rays. The primary nature ...
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Article
Discovery of an X-ray source coincident with the soft γ-ray repeater 0525 – 66
ALTHOUGH γ-ray bursters (GRBs) have been known for more than 20 years, no source has ever been identified in its quiescent state, which might provide clues to its nature. On the other hand, two of the three kn...
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Article
Two-population model for the sources of γ-ray bursts
RECENT measurements by the Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory Satellite suggest that the distribution of γ-ray burst sources is isotropic about the Earth's posit...
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Article
Annihilation near the centre
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Article
Solar flare neutron production and the angular dependence of the capture gamma-ray emission
The depth dependence of the production of neutrons and capture gamma-ray line emission are calculated by Monte Carlo simulation of the nuclear processes taking place when flare-accelerated ions interact with t...
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Article
Solar flare neutrons and their capture gamma ray emission
We briefly describe our recent Monte Carlo calculations of the energy and angular distributions of neutrons esca** from the solar atmosphere. Comparing the calculation results with measurements of the neutro...
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Article
Gamma-ray line astronomy
Recent gamma-ray line observations and their interpretations are reviewed and prospects for future line detections are discussed.
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Article
Gamma-ray lines and neutrons from solar flares
We have derived the energy spectrum of accelerated protons and nuclei at the site of the June 21, 1980 limb flare by a new technique, using observations of the time-dependent flux of high-energy neutrons at th...
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Chapter and Conference Paper
Gamma-ray Lines and Neutrons from Solar Flares
We have derived the energy spectrum of accelerated protons and nuclei at the site of the June 21, 1980 limb flare by a new technique, using observations of the time-dependent flux of high-energy neutrons at th...
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Chapter and Conference Paper
Gamma-Ray Line Astronomy
Recent gamma-ray line observations and their interpretations are reviewed and prospects for future line detections are discussed.
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Chapter
Active Galactic Nuclei
I have been invited to present a brief review of optical, infrared and ultraviolet observations of activity nuclei. I will only describe a small sub-set of these observations, in particular those which I belie...
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Article
Synchrotron cooling and annihilation of ane +-e − plasma: The radiation mechanism for the 5 March, 1979 transient
Positron-electron pair radiation is examined as a mechanism that could be responsible for the impulsive phase emission of the 5 March, 1979 transient. Synchrotron cooling and subsequent annihilation of the pai...
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Article
Origin of the 5 March 1979 γ-ray transient: a vibrating neutron star
An unusual γ-ray transient was observed on 5 March 1979, with 12 different instruments on 9 different spacecraft1–4. Most of these instruments are incorporated into an interplanetary γ-ray burst network. The sour...
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Article
γ-Ray line astronomy
γ-Ray astronomy is a valuable source of information on solar activity, supernovae and nucleosynthesis. Cosmic y-ray lines were first observed from solar flares and more recently from the galactic centre and a ...
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Chapter
Cosmic Ray Produced Neutrons and Nuclides in the Earth’s Atmosphere
Nuclear interactions of cosmic rays in the earth’s atmosphere produce an enormous variety of secondary particles, nuclides and radiation: neutrons, protons, antinucleons, electrons, positrons, neutrinos, meson...
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Article
Solar gamma rays
The theory of gamma-ray production in solar flares is treated in detail. Both lines and continuum are produced. The strongest line predicted at 2.225 MeV with a width of less than 100 eV and detected at 2.24±0...
