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Fröhlich, C.; Andersen, B. N.; Appourchaux, T.; Berthomieu, G.; Crommelynck, D.; Domingo, V.; Fichot, Alain; Finsterle, W.; Gómez, Maria F.; Gough, D. O.; Jiménez, A.; Leifsen, T.; Lombaerts, Marc; Pap, J. M.; Provost, J.; Cortés, T. Roca; Romero, J.; Roth, Hansjörg; Sekii, T.; Telljohann, U.; Toutain, T.; Wehrli, Christoph

doi:10.1023/a:1004969622753

Cited by 204 publications

(58 citation statements)

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“…We tested our method on solar-disk integrated light at solar maximum (January 2001 to March 2003), observed by the VIRGO instrument aboard SOHO (Frohlich et al 1997). The VIRGO green channel data were divided into 90-day segments, and we applied the method described in Sect.…”

Section: Discussionmentioning

confidence: 99%

Differential Rotation in Sun-like Stars from Surface Variability and Asteroseismology

Nielsen

2017

Springer Theses

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Section: Discussionmentioning

confidence: 99%

Differential Rotation in Sun-like Stars from Surface Variability and Asteroseismology

Nielsen

2017

Springer Theses

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“…Furthermore, the EVE program will incorporate physics-based models of solar EUV irradiance to advance the understanding of solar dynamics based on short-and long-term activity of solar magnetic features. ESP (Didkovsky et al, 2012) is one of five channels in the EVE suite. It is an advanced version of the SOHO/CELIAS/SEM (Hovestadt et al, 1995;Judge et al, 1998).…”

Section: Sdo/eve/esp Channelsmentioning

confidence: 99%

“…The count-rates are integrated over 0.25 seconds increments and transmitted to the EVE Science and Operations Center for data processing. An algorithm for converting the measured count rates into solar irradiance and the ESP calibration parameters are described by Didkovsky et al, ( , 2012.…”

Section: Sdo/eve/esp Channelsmentioning

confidence: 99%

“…The data reduction for this work was based on the use of the ESP zerothorder time series with original (Level 0D) effective count rate (counts s −1 ) corrected for energetic-particle events and temperature changes of dark counts (Didkovsky et al, 2012). The data were interpolated to eliminate short gaps (about two minutes total) that occur when the filters in the ESP filter-wheel and observing modes change during routine daily calibration.…”

Section: Data Reductionmentioning

confidence: 99%

“…The authors studied the oscillation power spectra of two six-day long time-series using the soft X-ray band-pass from the Extreme Ultraviolet Spectrophotometer (ESP) (Didkovsky et al, 2012) onboard the Solar Dynamics Observatory (SDO) Extreme Ultraviolet Variability Experiment (EVE: Woods et al, 2012). The largest amplitude peaks in the five-minute spectral region were compared with the lowdegree photospheric p-modes observed in Doppler velocity from the Birmingham Solar Oscillation Network (BiSON: Chaplin et al, 1998) and in visible light intensity (red channel) from the SOHO/VIRGO instrument (Andersen, 1991;Frohlich et al, 1997). This comparison showed that the frequencies of the coronal oscillations may deviate from the frequencies determined from the photospheric observations.…”

Section: Introductionmentioning

confidence: 99%

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Variability of Solar Five-Minute Oscillations in the Corona as Observed by the Extreme Ultraviolet Spectrophotometer (ESP) on the Solar Dynamics Observatory/Extreme Ultraviolet Variability Experiment (SDO/EVE)

Didkovsky¹,

Kosovichev²,

Judge³

et al. 2012

Solar Dynamics and Magnetism From the Interior to the Atmosphere

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Solar five-minute oscillations have been detected in the power spectra of two six-day time intervals from soft X-ray measurements of the Sun observed as a star using the Extreme Ultraviolet Spectrophotometer (ESP) onboard the Solar Dynamics Observatory (SDO) Extreme Ultraviolet Variability Experiment (EVE). The frequencies of the largest amplitude peaks were found matching within 3.7 µHz the known low-degree (ℓ = 0 -3) modes of global acoustic oscillations, and can be explained by a leakage of the global modes into the corona. Due to strong variability of the solar atmosphere between the photosphere and the corona the frequencies and amplitudes of the coronal oscillations are likely to vary with time. We investigate the variations in the power spectra for individual days and their association with changes of solar activity, e.g. with the mean level of the EUV irradiance, and its short-term variations due to evolving active regions. Our analysis of samples of one-day oscillation power spectra for a 49-day period of low and intermediate solar activity showed little correlation with the mean EUV irradiance and the short-term variability of the irradiance. We suggest that some other changes in the solar atmosphere, e.g. magnetic fields and/or inter-network configuration may affect the mode leakage to the corona.

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Interannual variation of global net radiation flux as measured from space

et al. 2016

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International audienceThe global net radiation flux (NRF) in and out of the climate system at the top of the atmosphere (TOA) varies at interannual time scales, reflecting the complexity of the processes responsible for attaining global energy equilibrium. These processes are investigated in this study using the previously unexplored data acquired by a bolometric type sensor installed in the PICARD microsatellite. The obtained anomalies in the NRF (PICARD-NRF) are compared to the global NRF changes at the TOA measured by the Clouds and Earth's Radiant Energy System mission (CERES-NRF). The interanual PICARD-NRF is strongly correlated with the matching period CERES-NRF; the bootstrapped correlation at the 95%( +0.85 and +0.97) confidence intervals(CIs) is +0.93. Consistency in the interannual variability in the NRF derived by two completely independent measurement systems enhances confidence in the estimated magnitude of these variations. To reveal the possible drivers of the NRF interannual variability, the NRF values were compared with the multivariate El Niño Southern Oscillation index (ENSO)

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Cited by 204 publications

References 0 publications

Differential Rotation in Sun-like Stars from Surface Variability and Asteroseismology

Differential Rotation in Sun-like Stars from Surface Variability and Asteroseismology

Variability of Solar Five-Minute Oscillations in the Corona as Observed by the Extreme Ultraviolet Spectrophotometer (ESP) on the Solar Dynamics Observatory/Extreme Ultraviolet Variability Experiment (SDO/EVE)

Interannual variation of global net radiation flux as measured from space

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