Fe/O ratio behavior as an indicator of solar plasma state at different solar activity manifestations and in periods of their absence

Минасянц Геннадий Сергеевич; Минасянц Тамара Михайловна; Томозов Владимир Михайлович

doi:10.12737/stp-41201804

УДК 52

FE/O RATIO BEHAVIOR AS AN INDICATOR OF SOLAR PLASMA STATE AT DIFFERENT SOLAR ACTIVITY MANIFESTATIONS AND IN PERIODS OF THEIR ABSENCE Fe/O ratio behavior as an indicator of solar plasma state at different solar activity manifestations and in periods of their absence

АА Аа

Опубликовано в Solar-Terrestrial Physics · Том 4, Номер 1 · Страницы 29–50 · Рубрика: Results of current research

DOI: https://doi.org/10.12737/stp-41201804

Получено: 30.03.2018 Одобрено: 16.03.2026 Язык публикаций: RUS

Авторы

МИ

Минасянц Геннадий Сергеевич

МИ

Минасянц Тамара Михайловна

ТО

Томозов Владимир Михайлович

МИ

Минасянц Геннадий Сергеевич

Ученая степень: кандидат физико-математических наук

Астрофизический институт им. В.Г. Фесенкова НАН РК Казахстан · Алматы

МИ

Минасянц Тамара Михайловна

Ученая степень: кандидат физико-математических наук

Астрофизический институт им. В.Г. Фесенкова НАН РК Казахстан · Алматы

ТО

Томозов Владимир Михайлович

Ученая степень: кандидат физико-математических наук

Институт солнечно-земной физики СО РАН Россия · Иркутск

АННОТАЦИЯ

We report the results of the investigation into plasma physical characteristics at various solar activity manifestations and in periods of their absence. These results have been obtained from quantitative estimates of the relative abundance of Fe/O ions in different energy ranges. Maximum values of the Fe/O ratio is shown to correspond to particle fluxes from impulsive flares for ions with energies <2 MeV/n (the most significant manifestation of the FIP effect). In particle fluxes from gradual flares, the Fe/O value decreases smoothly with ion energy and is noticeably inferior to values of fluxes in impulsive events. We have established that the properties of flares of solar cosmic rays indicate their belonging to a separate subclass in the total population of gradual events. Relying on variations in the abundance of Fe/O ions, we propose an xplanation of the solar plasma behavior during the development of flares of both classes. Magnetic clouds (a separate type of coronal mass ejections (CME)), which have regions of turbulent compression and are sources of strong geomagnetic storms, exhibit a relative composition of Fe ions comparable to the abundance of Fe in ion fluxes from gradual flares. We have found out that the Fe/O value can be used to detect penetration of energetic flare plasma into the CME body at the initial phase of their joint development and to estimate its relative contribution. During solar minimum with complete absence of sunspots, the Fe/O ratio during periods of “quiet” solar wind show absolutely low values of Fe/O=0.004–0.010 in the energy range from 2–5 to 30 MeV/n. This is associated with the manifestation of the cosmic ray anomalous component, which causes an increase in the intensity of ion fluxes with a high first ionization potential, including oxygen (O), and elements with a low first ionization potential (Fe) demonstrate weakening of the fluxes. As for particles with higher energies (Ek>30 MeV/n), the Fe/O increase is due to the decisive influence of galactic cosmic rays on the composition of impurity elements in the solar wind under solar minimum conditions. The relative content of heavy elements in galactic cosmic rays 30–500 MeV/n is similar to values in fluxes from gradual flares during high solar activity. During solar minimum without sunspots, the behavior of Fe/O for different ion energy ranges in plasma flows from coronal holes (CH) and in the solar wind exhibits only minor deviations. At the same time, plasma flows associated with the disturbed frontal CH region can be sources of moderate geomagnetic storms.

КЛЮЧЕВЫЕ СЛОВА

solar activity, energy spectra, FIP effect, Fe/O ratio

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ГОСТ

Минасянц Г. С., Минасянц Т. М., Томозов В. М. Fe/O ratio behavior as an indicator of solar plasma state at different solar activity manifestations and in periods of their absence // Solar-Terrestrial Physics. 2018. № 1. С. 29-50. DOI: https://doi.org/10.12737/stp-41201804. (дата обращения: 13.10.2026).

MLA

Минасянц Геннадий Сергеевич, Минасянц Т. М., Томозов В. М.. "Fe/O ratio behavior as an indicator of solar plasma state at different solar activity manifestations and in periods of their absence." Solar-Terrestrial Physics 4.1 (2018): 29-50. DOI: https://doi.org/10.12737/stp-41201804.

APA

Минасянц Г. С., Минасянц Т. М., Томозов В. М. (2018). Fe/O ratio behavior as an indicator of solar plasma state at different solar activity manifestations and in periods of their absence. Solar-Terrestrial Physics, 4(1), 29-50. https://doi.org/10.12737/stp-41201804

Chicago

Минасянц Геннадий Сергеевич, Минасянц Т. М., Томозов В. М.. "Fe/O ratio behavior as an indicator of solar plasma state at different solar activity manifestations and in periods of their absence." Solar-Terrestrial Physics 4, no. 1 (2018): 29-50. https://doi.org/10.12737/stp-41201804.

WIKI

{{cite journal | author = Минасянц Г. С., Минасянц Т. М., Томозов В. М. | title = Fe/O ratio behavior as an indicator of solar plasma state at different solar activity manifestations and in periods of their absence | journal = Solar-Terrestrial Physics | year = 2018 | volume = 4 | issue = 1 | pages = 29-50 | doi = 10.12737/stp-41201804 }}

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FE/O RATIO BEHAVIOR AS AN INDICATOR OF SOLAR PLASMA STATE AT DIFFERENT SOLAR ACTIVITY MANIFESTATIONS AND IN PERIODS OF THEIR ABSENCE Fe/O ratio behavior as an indicator of solar plasma state at different solar activity manifestations and in periods of their absence

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