The Wolf number and total solar irradiance variations during 21–23 solar cycles

Kononovich, E. V.; Mironova, Irina

doi:10.1080/10556790601106324

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…While for the green corona we get a rather pronounced periodicity of about 27 days, which is a well-established fact from many other solar indices, e.g. Kane (2002), Kononovich & Mironova (2006), the 27-day power spectra for the CCR is less pronounced, however, exists.…”

Section: Data and Analysissupporting

confidence: 64%

27‐day variations of solar indices and cosmic ray neutron monitor intensities

Minarovjech

Rusin²,

Санига

2008

Astron Nachr

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Solar activity indices (coronal, chromospheric as well as photospheric) and cosmic ray neutron monitor rates (different cut-off rigidity) have been used to study 27-day variations in the years from 1957 to 2004. Daily data were employed for this purpose, analysed by the FFT and wavelet techniques. To work with a continuous data set for the cosmic rays (CR), the 'Composite Cosmic Ray' (CCR) set was first created from the observations carried out at different neutron monitor stations. The CCR frequency analysis shows significant 27-day variations in the intensity of CR, with its amplitude's values very sensitive to the sign of the quantity qA. The most significant 27-day variations of CR were found not to correlate with those of other solar indices.

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Section: Data and Analysissupporting

confidence: 64%

27‐day variations of solar indices and cosmic ray neutron monitor intensities

Minarovjech

Rusin²,

Санига

2008

Astron Nachr

View full text Add to dashboard Cite

show abstract

“…Several studies (Schmahl & Kundu 1994;Lee et al 1995;Kononovich & Mironova 2006) showed that the total solar irradiance exhibits a solar cyclic variation and is a good indicator of solar activity. Pap et al (2002) reviewed the long-term variations in total solar irradiance and spectral irradiances, including the Mg ii center-to-wing ratio.…”

Section: Introductionmentioning

confidence: 99%

The Cyclic Variation of Solar Photospheric Intensity From Soho Images

Jeong¹,

Park²,

Moon³

et al. 2017

Journal of The Korean Astronomical Society

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Abstract:The well-known solar cycle controls almost the entire appearance of the solar photosphere. We therefore presume that the continuous emission of visible light from the solar surface follows the solar cyclic variation. In this study, we examine the solar cyclic variation of photospheric brightness in the visible range using solar images taken by the Solar and Heliospheric Observatory (SOHO)/Michelson Doppler Imager (MDI). The photospheric brightness in the visible range is quantified via the relative intensity acquired from in the raw solar images. In contrast to total solar irradiance, the relative intensity is out of phase with the solar cycle. During the solar minimum of solar cycles 23-24, the relative intensity shows enhanced heliolatitudinal asymmetry due to a positive asymmetry of the sunspot number. This result can be explained by the strength of the solar magnetic field that controls the strength of convection, implying that the emission in the visible range is controlled by the strength of convection. This agrees with the photospheric brightness increasing during a period of long spotless days.

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The Wolf number and total solar irradiance variations during 21–23 solar cycles

Cited by 2 publications

References 7 publications

27‐day variations of solar indices and cosmic ray neutron monitor intensities

27‐day variations of solar indices and cosmic ray neutron monitor intensities

The Cyclic Variation of Solar Photospheric Intensity From Soho Images

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