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Published 1973 | Published
Book Section - Chapter Open

Interstellar Electron Spectrum from the Galactic Non-Thermal Radio Emission


A range of interstellar electron spectra at energies between 100 MeV and 5 GeV has been derived from an analysis of the observed galactic non-thermal radio spectrum and from consideration of the existing uncertainties in the other relevant physical parameters of the galaxy. We find that for energies larger than ~ 300 MeV the electron spectrum is uncertain to a factor of 4 due to uncertainties in the galactic magnetic field strength and the total line-of-sight emission length. The uncertainty in the electron spectrum increases towards lower energies, exceeding a factor of 50 near 100 MeV, primarily due to uncertainties in the galactic parameters affecting interstellar radio absorption.

Additional Information

© 1973 University of Colorado. Provided by the NASA Astrophysics Data System. This work supported by the National Aeronautics and Space Administration, Grant NGR 05-002-160. One of us (Stone) was an Alfred P. Sloan research fellow, and another (Cummings) was a NASA Trainee during this work.

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August 19, 2023
October 26, 2023