München 2019 – wissenschaftliches Programm
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SYMD: Symposium SMuK Dissertationspreis 2019
SYMD 1: SMuK Dissertationspreis 2019
SYMD 1.1: Hauptvortrag
Montag, 18. März 2019, 14:00–14:30, Plenarsaal
Analysis of historical solar Ca II K and sunspot data for irradiance studies — •Theodosios Chatzistergos1, Natalie A Krivova2, Sami K Solanki2, Ilaria Ermolli1, Ilya Usoskin3, and Gennady Kovaltsov4 — 1INAF osservatorio astronomico di Roma, Monte Porzio Catone, Italy — 2Max Planck institute for solar system research, Göttingen, Germany — 3University of Oulu, Oulu, Finaland — 4Ioffe physical-technical institute, St. Petersburg, Russia
The Sun can affect Earth's climate, however the exact mechanisms or any long-term effects cannot be accurately determined with the available measurements of solar irradiance since 1976. Models have been successful at reconstructing the solar irradiance by using maps of the surface magnetic fields of the Sun which describe the competing contributions of the dark (sunspots) and bright (faculae) magnetic features. Such maps exist since 1974 and reconstructions for earlier periods rely mainly on sunspot data alone. Furthermore, the methods employed to cross-calibrate the sunspot data have been recently criticised. The missing information about faculae for the 20th century can be provided by Ca II K observations. These data have been quite unexplored due to various issues plaguing them and the lack of information on photographic plates' response on the incident radiation. Here we present our work to automatically process and calibrate the historical Ca II K data and derive information about the evolution of faculae. We further present a new reconstruction of the group sunspot number series with a non-linear and non-parametric procedure. Our results will allow for an improved understanding of the solar influence on Earth's climate.