The cyclic activity of the sun from observations of the activity indices at different time scales

Бруевич, Е. А.; Yakunina, G. V.

doi:10.3103/s0027134915040062

Cited by 11 publications

(14 citation statements)

References 9 publications

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“…The solar radio emission flux with a wavelength of 10.7 cm (F 10.7) is utilized as an indicator of SA in the MUAM radiation block. F10.7 features the cyclicity with a period of the main 11-year solar cycle [Tapping, 1987;Bruevich, Yakunina, 2015]. Changes in F10.7 correlate well with changes in Wolf numbers [Vitinsky et al, 1986].…”

Section: Consideration Of Sa In the Modelmentioning

confidence: 99%

Statistically Significant Estimates of Influence of Solar Activity on Planetary Waves in the Middle Atmosphere of the Northern Hemisphere as Derived From Muam Model Data

Koval

2019

Solar-Terrestrial Physics

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Numerical simulation has been used to examine the effect of changes in solar activity (SA) in the thermosphere on amplitudes of long-period planetary waves (PW) for the winter period in the Northern Hemisphere. The model of the middle and upper atmosphere (MUAM) is used. It allows simulations of general atmospheric circulation at altitudes 0–300 km. In order to reproduce SA changes, different values of the solar radio flux at a wavelength of 10.7 cm at an altitude of more than 100 km are set in the MUAM radiation block. To take into account the effect of charged particles in the ionosphere on the neutral gas dynamics, ionospheric conductivities for different SA levels are included in MUAM. To improve the statistical reliability of the results, two ensembles of model simulations consisting of 16 runs corresponding to the minimum and maximum SA have been obtained. The statistical confidence of average differences in PW amplitudes between high and low SA has been calculated. The results are shown to be reliable in almost the entire altitude range 0–300 km. Results of the simulations have shown for the first time that statistically significant differences in amplitudes of long-period PWs can reach 10–15 % in the middle atmosphere of the Northern Hemisphere, depending on the zonal wave number. At the same time, reflection of PWs at altitudes of lower thermosphere has a significant effect on the PW structure in the middle atmosphere.

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Section: Consideration Of Sa In the Modelmentioning

confidence: 99%

Statistically Significant Estimates of Influence of Solar Activity on Planetary Waves in the Middle Atmosphere of the Northern Hemisphere as Derived From Muam Model Data

Koval

2019

Solar-Terrestrial Physics

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“…The periods of the quasi-biennial cycles vary considerably within one 11-yr cycle, decreasing from 3.5 to 2 yrs (see Figure 5b,c), which complicates a study of such periodicity with the periodogram method. Using methods of frequency analysis of signals, the quasi-biennial cycles have been studied not only for the relative sunspot number, but also for 10.7 cm solar radio emission and for some other indices of solar activity, see Bruevich & Yakunina (2015). It was also shown that the cyclicity on the quasi-biennial time scale often takes place among stars with 11-yr cyclicity, see Bruevich & Kononovich (2011).…”

Section: Cyclic Activity Of Hk-project Stars From Periodogram To Wavmentioning

confidence: 99%

“…We used the complex Morlet wavelet 1.5 -1 which can most accurately determine the dominant cyclicity as well as its evolution in time in solar data sets at different wavelengths and spectral intervals (Bruevich & Yakunina 2015).…”

Section: Cyclic Activity Of Hk-project Stars From Periodogram To Wavmentioning

confidence: 99%

Magnetic cycles of Sun-like stars with different levels of coronal and chromospheric activity — comparison with the Sun

Shimanovskaya

Bruevich

Бруевич

2016

Res. Astron. Astrophys.

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The atmospheric activity of the Sun and Sun-like stars is analyzed involving observations from HK-project at the Mount Wilson Observatory, the California and Carnegie Planet Search Program at the Keck and Lick Observatories and the Magellan Planet Search Program at the Las Campanas Observatory. We show that for stars of F, G and K spectral classes, the cyclic activity, similar to the 11-yr solar cycles, is different: it becomes more prominent in K-stars. Comparative study of Sun-like stars with different levels of the chromospheric and coronal activity confirms that the Sun belongs to stars with the low level of the chromospheric activity and stands apart among these stars by the minimum level of its coronal radiation and the minimum level of its variations of the photospheric flux.

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“…Происходящие изменения сопровождаются сменой взаимоотношений между различными структурами развивающегося организма и закономерными непрерывными преобразованиями протекающих с их участием процессов. Особенности изменений, проявляемые на уровне физиологических и морфологических признаков, является основой периодизации индивидуального развития 2,3,4,5 .…”

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“…Она происходит на уровне регуляторных процессов при изме-няющихся соотношениях неблагоприятных факторов, которые могут влиять на развитие детей во внутриутробном периоде и при их рождении [1], отражая эффекты средовых воздействий [2][3][4], в том числе разных типов излучения. Одним из главных природных источников их колебаний является изменение солнечной активности [5,6].…”

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Variation of Indicators of Newborn Physical Development as a Manifestation of Adaptive Self-Organization of Their Systems to Changing Environmental Conditions

Чернова¹,

Сидоров²,

Сидоров³

et al. 2021

PH&LE

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Introduction: Many published data on variability of anthropometric characteristics of newborns related to the influence of adverse environmental factors during their antenatal development have been accumulated by now. The purpose of our work was to study the relationship between certain parameters of antenatal physical development of newborns and varying environmental and climatic conditions. Materials and methods: Anthropometric measurements were taken in the delivery room immediately after birth and then assessed against environmental and climatic characteristics of the antenatal period. Results: We established the relationship between the exposure to different environmental and climatic factors, including radiation, during the antenatal period and anthropometric characteristics of the examined newborns. We observed a quantitative variety of signs and found that the body mass was most “sensitive” to the impact of adverse environmental factors. At the same time, the phenogenetic analysis helped establish a significant effect of atmospheric pressure on the body mass. The effects of radiation exposure were, to a greater extent, associated with the signs of influence of both environmental (including the total and ultraviolet radiation – in 57.3 % and 67.8 % of cases, respectively) and genetic factors (in 42.7 % and 32.2 % of cases, respectively). Conclusion: The established genotype-environment effects of exposures to changing environmental and climatic conditions prove the importance of continuing longitudinal observations of the examined infants using a cytogenetic analysis.

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The cyclic activity of the sun from observations of the activity indices at different time scales

Cited by 11 publications

References 9 publications

Statistically Significant Estimates of Influence of Solar Activity on Planetary Waves in the Middle Atmosphere of the Northern Hemisphere as Derived From Muam Model Data

Statistically Significant Estimates of Influence of Solar Activity on Planetary Waves in the Middle Atmosphere of the Northern Hemisphere as Derived From Muam Model Data

Magnetic cycles of Sun-like stars with different levels of coronal and chromospheric activity — comparison with the Sun

Variation of Indicators of Newborn Physical Development as a Manifestation of Adaptive Self-Organization of Their Systems to Changing Environmental Conditions

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