Long-term intensity decrease in the 8- to 25-MeV proton fluxes at low L values

Details Long-term intensity decrease in the 8- to 25-MeV proton fluxes at low L values Long-term intensity decrease in the 8- to 25-MeV proton fluxes at low L values

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....8611447p&link_type=abstract

Journal of Geophysical Research, vol. 86, Dec. 1, 1981, p. 11447-11450.

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Energetic Particles, Long Term Effects, Magnetically Trapped Particles, Magnetospheric Proton Density, Proton Flux Density, Magnetic Storms, Particle Acceleration, Satellite Sounding, Solar Cycles

Scientific paper

The steady decrease of 8-25 MeV proton fluxes at L values not greater than 1.9, over a 13-year observation period, is established by five independent sets of observations which confirm that the proton flux decay originally noted between 1964 and 1968 has continued until at least 1976. Mean life (tau) figures for the proton flux decay at L values of 1.35 and 1.9 are 5.7 + or - 0.5 years, and 4.55 + or - 0.16 years, respectively. The 13-year decrease cannot be related to the 11-year solar cycle. Natural and artificial effects explaining this phenomenon are considered, and it is concluded that the most probable cause is the decay of high energy protons redistributed by the 'Starfish' high-altitude nuclear explosion.

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