Spotting in stars with a low level of activity, close to solar activity

Бруевич, Е. А.; Alekseev, I. Yu.

doi:10.1007/s10511-007-0018-6

Cited by 15 publications

(7 citation statements)

References 5 publications

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“…We have to point out that close interconnection between radiation fluxes characterized the energy release from different atmosphere's layers is the widespread phenomenon among the stars of late-type spectral classes. Bruevich & Alekseev (2007) confirmed that there exists the close interconnection between photospheric and coronal fluxes variations for solar-type stars of F, G, K and M spectral classes with widely varying activity of their atmospheres. It was shown that the sum of areas of spots and the values of X-ray fluxes increase gradually from the Sun and HK project stars with the low spotted discs to the highly spotted K and M-stars.…”

Section: Introductionmentioning

confidence: 52%

General trends in the change in solar activity indices in the period from the late XX to early XXI century

Бруевич

Yakunina

2015

Geomagn. Aeron.

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The analysis of the observations of solar activity indexes SSN (NOAA Sunspot Numbers), the radio flux at a wavelength of 10.7 cm (F 10.7 ) and the solar constant (TSI) during the cycles 22 -24 is presented. We found a decrease of the observed values of the SSN obs which was calculated with SSN syn (using regression relationships between SSN and F 10.7 ) after 1990 year on 20 -25% instead of 35%, as was previously assumed. The changes in characteristics of the most popular index, SSN, such as decrease in the number of sunspots, the reduction of the magnetic field in small and medium-sized spots are not in full compliance with the proposed scenario of solar activity predicted by radio flux F 10.7 in the cycles 23 and 24, and cannot be fully explained by the influence on the SSN values of additional minimum of 50 -70 year cycle. We have also showed that the observed changes of SSN lead to a slight increase of the solar constant TSI during the cycles 23 -24 compared to the cycle 22.

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Section: Introductionmentioning

confidence: 52%

General trends in the change in solar activity indices in the period from the late XX to early XXI century

Бруевич

Yakunina

2015

Geomagn. Aeron.

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“…We have to point out that close interconnection between radiation fluxes characterized the energy release from different atmosphere's layers is the widespread phenomenon among the stars of late-type spectral classes, see Bruevich (2015a). It was confirmed that there exists the close interconnection between photospheric and coronal fluxes variations for sun-like stars of F, G, K and M spectral classes with widely varying activity of their atmospheres, see Bruevich and Alekseev (2007), Bruevich et al (2001). It was also shown that the summary areas of spots and values of X-ray fluxes increase gradually from the sun and sun-like HK project stars with the low spotted discs to the highly spotted K and M-stars.…”

Section: Wavelet-analysis Of Series Of Observations Of Ssnmentioning

confidence: 64%

Wavelet-analysis of series of observations of relative sunspot numbers. The dependence of the periods of cyclic activity on the time at different time scales

Борисов¹,

Бруевич²,

Bruevich³

et al. 2015

Preprint

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We applied the method of continuous wavelet-transform to high-quality time-frequency analysis to the sets of observations of relative sunspot numbers. Wavelet analysis of these data reveals the following pattern: at the same time there are several activity cycles whose periods vary widely from the quasi biennial up to the centennial period. These relatively low-frequency periodic variations of the solar activity gradually change the values of periods of different cycles in time. This phenomenon can be observed in every cycle of activity.

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“…We have to point out that close interconnection between radiation fluxes characterized the energy release from different atmosphere's layers is the widespread phenomenon among the stars of late-type spectral classes, see [3]. It was confirmed that there exists the close interconnection between photospheric and coronal fluxes variations for Sun-like stars of F, G, K and M spectral classes with widely varying activity of their atmospheres, see [4], [5]. It was also shown that the summary areas of spots and values of X-ray fluxes increase gradually from the sun and Sun-like Mount Wilson HK project stars [6] with the low spotted discs to the highly spotted K and Mstars.…”

Section: Introductionmentioning

confidence: 74%

Evolution of the cycles of magnetic activity of the Sun and Sun-like stars in time

Bruevich,

Artamonov

2016

Preprint

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We applied the method of continuous wavelet-transform to the timefrequency analysis to the sets of observations of relative sunspot numbers, sunspot areas and to 6 Mount Wilson HK-project stars with well-defined magnetic cycles. Wavelet analysis of these data reveals the following pattern: at the same time there are several activity cycles whose periods vary widely from the quasi-biennial up to the centennial period for the Sun and vary significant during observations time of the HK-project stars. These relatively low-frequency periodic variations of the solar and stellar activity gradually change the values of periods of different cycles in time. This phenomenon can be observed in every cycles of activity.

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Spotting in stars with a low level of activity, close to solar activity

Cited by 15 publications

References 5 publications

General trends in the change in solar activity indices in the period from the late XX to early XXI century

General trends in the change in solar activity indices in the period from the late XX to early XXI century

Wavelet-analysis of series of observations of relative sunspot numbers. The dependence of the periods of cyclic activity on the time at different time scales

Evolution of the cycles of magnetic activity of the Sun and Sun-like stars in time

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