Energy spectra and relative abundances of ions of C,O, and Fe at 1 AU during the quiet sun |
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| Authors: | M A Zel’dovich Yu I Logachev G M Surova |
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| Institution: | 1.Skobel’tsyn Nuclear Physics Institute,Moscow State University,Moscow,Russia |
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| Abstract: | The ion composition of fluxes of charged particles in interplanetary space with energies ∼0.03–10 MeV/nucleon are studied
during quiet periods in the 23rd solar-activity cycle using data from the ACE spacecraft. Apart from the activity minimum,
the Fe/O ratio during such periods corresponds to either the relative abundances of ions in particle fluxes accelerated in
solar flares or the mean abundances of elements in the solar corona. At the cycle minimum, this ratio takes on values characteristic
for the solar wind. These results indicate that the background fluxes of low-energy particles in the phases of the growth,
maximum, and decay of the solar cycle include significant contributions from both coronal particles accelerated to suprathermal
energies and particles accelerated in small impulsive solar flares. The particle fluxes from such flares are distinguished
by an enhanced abundance of iron ions. |
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