On the oxygen and nitrogen enhancements observed in low energy cosmic rays

Details On the oxygen and nitrogen enhancements observed in low energy cosmic rays On the oxygen and nitrogen enhancements observed in low energy cosmic rays

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icrc....2..810f&link_type=abstract

In: International Cosmic Ray Conference, 14th, Munich, West Germany, August 15-29, 1975, Conference Papers. Volume 2. (A76-26851

Astronomy and Astrophysics

Astronomy

3

Astronomical Models, Cosmic Rays, Neutral Particles, Nitrogen, Oxygen, Particle Acceleration, Energy Spectra, Interplanetary Medium, Interstellar Gas, Plasma-Particle Interactions, Solar Activity Effects, Solar Wind

Scientific paper

Fisk et al. (1974) have suggested that neutral particles are ionized in the solar cavity, are subsequently picked up by the solar wind, obtaining energies of about 1 keV/nucleon, and may be further accelerated to about 10 MeV/nucleon in the interplanetary medium. The requirements for this acceleration are examined, and a possible acceleration model is outlined. The acceleration must be performed in a time less than the dwell time of the interstellar ions in the solar cavity and must compete successfully against adiabatic cooling. The energy required for the acceleration must be less than the energy available in variations in the solar wind flow. The accelerator must act inefficiently on solar wind electrons and protons, and perhaps upon the majority of interstellar ions. It is shown that these requirements can be satisfied by a model in which acceleration results from transit-time damping of long-wavelength magnetosonic turbulence.

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