J/A+A/624/A57ivo://CDS.VizieR/J/A+A/624/A57doi:10.26093/cds/vizier.36240057CDSLoehner-Boettcher J.Schmidt W.Schlichenmaier R.Steinmetz T.,Holzwarth R.2019-05-06T15:25:30Z2019-04-09T06:42:34ZCDS support team

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

cds-question@unistra.frsolar-systemthe-sunvisible-astronomyspectroscopyConvective motions in the solar atmosphere cause spectral lines to become asymmetric and shifted in wavelength. For photospheric lines, this differential Doppler shift varies from the solar disk center to the limb. Precise and comprehensive observations of the convective blueshift and its center-to-limb variation improve our understanding of the atmospheric hydrodynamics and ensuing line formation, and provide the basis to refine 3D models of the solar atmosphere. We performed systematical spectroscopic measurements of the convective blueshift of the quiet Sun with the Laser Absolute Reference Spectrograph (LARS) at the German Vacuum Tower Telescope. The spatial scanning of the solar disk covered 11 heliocentric positions each along four radial (meridional and equatorial) axes. The high-resolution spectra of 26 photospheric to chromospheric lines in the visible range were calibrated with a laser frequency comb to absolute wavelengths at the 1m/s accuracy. Applying ephemeris and reference corrections, the bisector analysis provided line asymmetries and Doppler shifts with an uncertainty of only few m/s. To allow for a comparison with other observations, we convolved the results to lower spectral resolutions.2019A&A...624A..57Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/624/A57CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/624/A57https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/624/A57http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/624/A57https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/624/A57https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/624/A57http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/624/A57GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapAssociated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/624/A57OpticaldefaultJ/A+A/624/A57/listList of spectraspShow the spectrummeta.ref.urlcharNxNumber of pixels along X-axismeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharAssocDataAssociated Data web pagemeta.ref.urlchar