Relative ion Fe,C and O abundances in quiet time particle fluxes in the 23 SC |
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Authors: | V.N. Ishkov,M.A. Zeldovich,K. Kecskemé ty,Yu.I. Logachev |
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Affiliation: | 1. Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, RAN, Russia;2. Skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State University, Russia;3. KFKI Research Institute for Particle and Nuclear Physics MAT, Budapest, Hungary |
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Abstract: | Using ACE and SOHO data the origin of quiet-time low-energy particle fluxes at 1 AU is studied in the 23rd solar cycle. One of the selection criteria of quiet-time periods is to demand that H/He < 10 provided that periods with noticeable contribution of remnants of gradual events have been excluded from consideration. Our results suggest different origin of 0.03–3 MeV/nucleon particles – different seed populations accelerated and different acceleration processes. During the ascending, maximum and descending phases of solar activity quiet-time ions consist of coronal particles accelerated to suprathermal energies in about a half of the quiet periods, the rest of quiet-time fluxes originates from particle acceleration in processes similar to those in small impulsive solar flares rich in Fe. At solar minimum the bulk solar wind particles serve as seed population. |
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Keywords: | Solar energetic particles Ion abundances Particle emission |
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