J/ApJS/210/12ivo://CDS.VizieR/J/ApJS/210/12doi:10.26093/cds/vizier.22100012CDSBochsler P.Kucharek H.Mobius E.Bzowski M.Sokol J.M.Didkovsky L.,Wieman S.2017-07-03T14:27:19Z2014-02-10T09:55:28ZCDS support team

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

cds-question@unistra.fratomic-physicsinterstellar-mediumthe-sunultraviolet-astronomyExtreme UV (EUV) spectra from the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED)/Solar EUV Experiment are used to infer photoionization rates in the inner heliosphere. Relating these rates to various proxies describing the solar EUV radiation, we construct a multi-linear model which allows us to extrapolate ionization rates back to periods when no routine measurements of the solar EUV spectral distribution have been available. Such information is important, e.g., for comparing conditions of the interstellar neutral particles in the inner heliosphere at the time of Ulysses/GAS observations with conditions during the more recent observations of the Interstellar Boundary Explorer. From a period of 11 yr when detailed spectra from both TIMED and three proxies -- Solar and Heliospheric Observatory/CELIAS/SEM-rates, F10.7 radio flux, and Mg II core-to-wing indices -- have been available, we conclude that the simple model is able to reproduce the photoionization rates with an uncertainty of typically 5%.2014ApJS..210...12Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/210/12CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/717/674 : Ionization energies of CnN(n=4-12) (Kostko+, 2010)J/ApJ/707/482 : Models of the solar atmosphere. III. (Fontenla+, 2009)J/ApJ/667/1119 : Photoionization of H in strong magnetic fields (Zhao+, 2007)J/A+A/439/387 : Absolute photoionization cross sections (Bizau+, 2005)J/A+A/432/1063 : Analysis of inner solar corona in EUV (Lanzafame+, 2005)J/A+A/422/337 : Solar EUV Post-Eruptive Arcades (Tripathi+, 2004)J/ApJ/543/1016 : EUV spectrum of solar active region (Brosius+ 2000)J/A+AS/113/237 : Ultraviolet Spectrum of the Sun (Samain, 1995)J/ApJS/91/461 : EUV spectrum of solar active region (Thomas+, 1994)http://www.usc.edu/dept/space_science/sem_data/downloadSEM.html : SEM datahttp://lasp.colorado.edu/see/see_data.html : TIMED/SEE web sitehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/210/12https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/210/12http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/210/12https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/210/12https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/210/12http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/210/12GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVdefaultJ/ApJS/210/12/table2Adjusted radio-flux ratesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObs[1978/2012] Year of the observationtime.epochYear[1978/2013] Fractional year timeyrtime.epoch;arith.ratiodoubleHRate[0.73/1.2] H photoionization rate1e-07s**-1phys.ionizParam.raddoubleHeRate[0.77/1.6] He photoionization rate1e-07s**-1phys.ionizParam.raddoubleORate[0.79/1.4] O photoionization rate1e-07s**-1phys.ionizParam.raddoubleNeRate[0.78/1.8] Ne photoionization rate1e-07s**-1phys.ionizParam.raddoubleJ/ApJS/210/12/table1Photoionization rates for H, He, O, and Ne at the location of the EarthrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNum[1/255] Spectrum index numbermeta.id;obsintObs[2002/2012] Year of the observationtime.epochStartStart timestime.startfloatEndEnd timestime.epochfloatYear[2002/2013] Fractional year timeyrtime.epoch;arith.ratiodoubleHRate[5.4e-8/1.9e-7] H photoionization rate1e-07s**-1phys.ionizParam.radfloatHeRate[4.1e-8/1.9e-7] He photoionization rate1e-07s**-1phys.ionizParam.radfloatORate[1.8e-7/7.1e-7] O photoionization rate1e-07s**-1phys.ionizParam.radfloatNeRate[1.2e-7/7.1e-7] Ne photoionization rate1e-07s**-1phys.ionizParam.radfloat