Particle spectra in quiet-sun conditions and in conditions of solar activity

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Proton Flux Density, Solar Activity Effects, Solar Cycles, Spectral Energy Distribution, Temporal Distribution, Interplanetary Space, Proton Energy

Scientific paper

Time variations of proton energy spectra at energies up to 1 MeV are investigated on the basis of interplanetary measurements made in quiet periods of solar activity, i.e., in the absence of solar-cosmic-ray flares. It is suggested that background protons with energies of 1-4.5 MeV possibly have a solar origin. It is proposed that the background flux be defined as the particle flux at the minimum of the cycle. SInce in other phases of the solar cycle minimum levels of proton intensity and quiet-time intensity levels correlate with the solar-activity cycle, this additional flux into interplanetary space is lkely to be of solar origin.

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