TY JOUR TI Fe/O ratio behavior as an indicator of solar plasma state at different solar activity manifestations and in periods of their absence KW solar activity KW energy spectra KW FIP effect KW Fe/O ratio JO Solar-Terrestrial Physics AU Minasyants, G.S. AU Minasyants, T.M. AU Tomozov, V.M. PY 2018 IS 4 PB INFRA-M Academic Publishing LLC.