Implications of time variations for the origin of low energy cosmic ray nitrogen and oxygen nuclei

Details Implications of time variations for the origin of low energy cosmic ray nitrogen and oxygen nuclei Implications of time variations for the origin of low energy cosmic ray nitrogen and oxygen nuclei

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icrc....2..804m&link_type=abstract

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

Physics

Nuclear Physics

4

Cosmic Rays, Energy Spectra, Nitrogen, Nuclei (Nuclear Physics), Oxygen, Time Dependence, Galactic Radiation, Helium, Imp, Modulation, Particle Acceleration, Satellite Observation, Solar Protons

Scientific paper

Time variations have been observed in the quiet time intensities of 5-27 MeV/nuc nitrogen and oxygen and 13-25 MeV/nuc helium nuclei measured by spectrometers aboard IMPs 7 and 8. There is no significant correlation of the O variations with variations in the low intensity fluxes of 1-2 MeV solar protons, but the O intensity is well correlated with the modulation of galactic cosmic rays. These observations indicate that the enhanced low energy N and O fluxes are not of solar origin, and suggest that the acceleration mechanism required by the model of Fisk et al. (1974) must be located far enough from the sun that the singly charged ions, once accelerated, undergo considerable modulation in penetrating to 1 AU. Comparison of the time variations of He and O fluxes may yield information on the charge state of these nuclei, since these variations are strongly correlated and exhibit similar hysteresis effects when compared with the neutron monitor.

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