Variations in the Fe/O value resulting from changes in the ion energy in flows of accelerated solar particles |
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Authors: | G S Minasyants T M Minasyants V M Tomozov |
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Institution: | 1.Fesenkov Astrophysical Institute,National Academy of Sciences of Kazakh Republic,Almaty,Kazakhstan;2.Institute of Solar?Terrestrial Physics, Siberian Branch,Russian Academy of Sciences,Irkutsk,Russia |
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Abstract: | Qualitative estimates of the relative iron and oxygen ions (Fe/O) in flows of solar cosmic rays from impulsive and long-duration solar flares are obtained for different ion energy ranges. The Fe/O value serves as a measuring unit for the known FIP effect in the solar atmosphere. It is shown that the FIP effect is most evident (maximum Fe/O values) in impulsive events for ions at energies <2 MeV/n. In long-duration events, the Fe/O value gradually decreases in parallel with ion energy and its maximum values are observable in the area of relatively low energies. The comparison of some flare models provided grounds for a qualitative explanation of the Fe/O behavior in response to changes in ion energies for both classes of solar cosmic ray (SCR) events. |
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