J/A+A/624/A36ivo://CDS.VizieR/J/A+A/624/A36doi:10.26093/cds/vizier.36240036CDSDel Zanna G.2019-04-08T14:44:29Z2019-04-03T06:42:17ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frthe-sunsolar-systemultraviolet-astronomyWe benchmark new atomic data against a selection of irradiances obtained from medium-resolution quiet-Sun spectra in the extreme ultraviolet (EUV), from 60 to 1040{AA}. We used as a baseline the irradiances measured during solar minimum on 2008 April 14 by the prototype (PEVE) of the Solar Dynamics Observatory Extreme ultraviolet Variability Experiment (EVE). We took into account some inconsistencies in the PEVE data, using flight EVE data and irradiances we obtained from Solar and Heliospheric Observatory (SoHO) Coronal Diagnostics Spectrometer (CDS) data. We performed a differential emission measure and find overall excellent agreement (to within the accuracy of the observations, about 20%) between predicted and measured irradiances in most cases, although we point out several problems with the currently available ion charge-state distributions. We used the photospheric chemical abundances of Asplund et al. (2009ARA&A..47..481A). The new atomic data are nearly complete in this spectral range for medium-resolution irradiance spectra. Finally, we used observations of the active Sun in 1969 to show that the composition of the solar corona up to 1MK is nearly photospheric in this case as well. Variations of a factor of 2 are present for higher-temperature plasma, which is emitted within active regions. These results are in excellent agreement with our previous findings.2019A&A...624A..36Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/624/A36CatalogResearchIsServedByTAP VizieR generic servicerelated-toVI/152 : SOVAP-PICARD total solar irradiance (Meftah+, 2016)J/ApJ/789/117 : Solar spectral irradiance (Marchenko+, 2014)J/A+A/581/A26 : Solar Lyman irradiance line profiles (Lemaire+, 2015)J/other/SoPh/291.3527 : SOLAR/SOLSPEC UV SSI from 2008-2015 (Meftah+, 2016)J/A+A/611/A1 : SOLAR/SOLSPEC Spectral Irradiance - 0.5-3000nmhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/624/A36https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/624/A36http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/624/A36https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/624/A36https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/624/A36http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/624/A36GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVdefaultJ/A+A/624/A36/tablea1EUV irradiances of the quiet SunrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaObserved wavelength0.1nmem.wlfloatIobsMeasured irradiance1e+08ph.cm**-2.s**-1.arcsec**-1phot.fluxfloatlogTmaxMaximum effective temperaturelog(K)phys.temperature.effective;stat.maxfloatlogTeffEffective temperaturelog(K)phys.temperature.effectivefloatRRatio between the predicted and observed irradiance valuesphot.flux;arith.ratiofloatIonMain contributing Ionphys.atmol.ionStagecharlambadExpIon CHIANTI wavelength0.1nmem.wldoublerFractional contribution to the blendstat.fit.paramfloat