High-energy protons produced by a large-amplitude magnetosonic wave and associated gamma radiation through neutral pion decay

Details High-energy protons produced by a large-amplitude magnetosonic wave and associated gamma radiation through neutral pion decay High-energy protons produced by a large-amplitude magnetosonic wave and associated gamma radiation through neutral pion decay

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasj...42..551o&link_type=abstract

Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 42, no. 4, 1990, p. 551-565.

Astronomy and Astrophysics

Astronomy

1

Gamma Ray Spectra, Magnetoelastic Waves, Pions, Solar Flares, Solar Protons, Bessel Functions, Energy Spectra, Magnetosonic Resonance, Molecular Collisions, Particle Acceleration

Scientific paper

The spectra of ions accelerated by a large-amplitude magnetosonic wave and the spectra of gamma radiation from the decay of neutral pions which are produced in energetic ion collisions were studied through particle simulations and numerical calculations. A large-amplitude magnetosonic wave can promptly accelerate ions to relativistic energies in a rather strong magnetic field (omega/ce/ greater than omega/pe/). This acceleration is much more rapid and efficient than the usual stochastic acceleration and can occur in solar flares. The maximum energy is, however, well defined, and the ion spectra have strong downward curvatures near the maximum values. A particle simulation shows that this mechanism can produce a (truncated) power-law form with a spectral index of s = 1.2. The energy spectra of the gamma radiation were numerically obtained for this type of ion energy spectrum and for modified Bessel function forms derived from a stochastic acceleration model.

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