Virgo: Experiment for Helioseismology and Solar Irradiance Monitoring

Fröhlich, C.; Romero, J.; Roth, Hansjörg; Wehrli, Christoph; Andersen, B. N.; Appourchaux, T.; Domingo, V.; Telljohann, U.; Berthomieu, G.; Delache, P.; Provost, J.; Toutain, T.; Crommelynck, D.; Chevalier, André; Fichot, Alain; Däppen, Werner; Gough, D. O.; Hoeksema, J. T.; Jiménez, A.; Gómez, Maria F.; Herreros, J. M.; Cortés, T. Roca; Jones, A. R.; Pap, J. M.; Willson, R. C.

doi:10.1007/978-94-009-0191-9_4

Cited by 64 publications

(64 citation statements)

References 21 publications

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“…It has been recently noticed 2 To test our calculations against observations we have utilised TSI time series obtained by the PREMOS instrument 25 onboard the PICARD mission and the VIRGO instrument 26 onboard the Solar and Heliospheric Observatory (SOHO). The PREMOS and VIRGO data are complementary in a sense that they allow reliable calculation of the TSI power spectra on timescales longer and shorter than 3.5 hours, respectively (see Methods section).…”

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confidence: 99%

The nature of solar brightness variations

et al. 2017

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confidence: 99%

The nature of solar brightness variations

et al. 2017

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“…We compared the TSI reconstruction to the measurements from the two solar radiometers that operated over the same period, SORCE/TIM [38] and SoHO/VIRGO [39]. variability that is of interest rather than the absolute radiative flux, we normalized the reconstruction and the VIRGO record to the TIM record, the absolute radiometry of which is widely accepted as the most accurate [40][41][42].…”

Section: The Tsi Model Is a Major Extension Of The Semi-empirical Modmentioning

confidence: 99%

Solar Irradiance Variability is Caused by the Magnetic Activity on the Solar Surface

et al. 2017

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The variation in the radiative output of the Sun, described in terms of solar irradiance, is important to climatology. A common assumption is that solar irradiance variability is driven by its surface magnetism. Verifying this assumption has, however, been hampered by the fact that models of solar irradiance variability based on solar surface magnetism have to be calibrated to observed variability. Making use of realistic three-dimensional magnetohydrodynamic simulations of the solar atmosphere and state-of-the-art solar magnetograms from the Solar Dynamics Observatory, we present a model of total solar irradiance, TSI that does not require any such calibration. In doing so, the modelled irradiance variability is entirely independent of the observational record.(The absolute level is calibrated to the TSI record from the Total Irradiance Monitor, TIM). The model replicates 95% of the observed variability between April 2010 and July 2016, leaving little scope for alternative drivers of solar irradiance variability at least over the timescales examined (days to years).

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“…The period of this structure is approximately 2 years. Fletcher et al (2010) showed that the signal was visible in both BiSON and GOLF data and Broomhall et al (2010) demonstrated that the quasi-biennial signal was also evident in Variability of solar IRradiance and Gravity Oscillations (VIRGO; Fröhlich et al 1995) data. VIRGO consists of three sun photometers (SPMs), that observe at different wavelengths, namely the blue channel (402 nm), the green channel (500 nm), and the red channel (862 nm).…”

Section: Evidence For Shorter-term Variations In Solar P-mode Frequenmentioning

confidence: 98%

Helioseismology - a clear view of the interior

2011

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Abstract. Helioseismology is a very powerful tool that allows us to explore the interior of the Sun. Here we give particular emphasis to the justification for the likely location of the zone that is most sensitive to cycle-related changes. For the low degree modes we find that more than one timescale for changes in the oscillations is discovered. We also note the successive cycles have differing sensitivities to the activity. We end with a warning of the risk of being misled with short datasets such as are seen with stellar data.

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Virgo: Experiment for Helioseismology and Solar Irradiance Monitoring

Cited by 64 publications

References 21 publications

The nature of solar brightness variations

The nature of solar brightness variations

Solar Irradiance Variability is Caused by the Magnetic Activity on the Solar Surface

Helioseismology - a clear view of the interior

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