caa a22 4500 445346434 CHVBK 20180317142830.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s11207-011-9820-8 doi (NATIONALLICENCE)springer-10.1007/s11207-011-9820-8 Improvements in the Determination of ISS Ca ii K Parameters [Elektronische Daten] [L. Bertello, A. Pevtsov, J. Harvey, R. Toussaint] Measurements of the ionized Ca iiK line are one of the major resources for long-term studies of solar and stellar activity. They also play a critical role in many studies related to solar irradiance variability, particularly as a ground-based proxy to model the solar ultraviolet flux variation that may influence the Earth's climate. Full disk images of the Sun in Ca iiK have been available from various observatories for more than 100 years and latter synoptic Sun-as-a-star observations in Ca iiK began in the early 1970s. One of these instruments, the Integrated Sunlight Spectrometer (ISS) has been in operation at Kitt Peak (Arizona) since late 2006. The ISS takes daily observations of solar spectra in nine spectra bands, including the Ca iiK and H lines. We describe recent improvements in data reduction of Ca iiK observations, and present time variations of nine parameters derived from the profile of this spectral line. Springer Science+Business Media B.V., 2011 Solar activity, observations, data analysis nationallicence Chromosphere, active nationallicence Bertello L. National Solar Observatory, 950 North Cherry Avenue, Tucson, AZ, USA aut Pevtsov A. National Solar Observatory, 88349, Sunspot, NM, USA aut Harvey J. National Solar Observatory, 950 North Cherry Avenue, Tucson, AZ, USA aut Toussaint R. National Solar Observatory, 950 North Cherry Avenue, Tucson, AZ, USA aut Solar Physics Springer Netherlands 272/2(2011-09-01), 229-242 0038-0938 272:2<229 2011 272 11207 https://doi.org/10.1007/s11207-011-9820-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9820-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bertello L. National Solar Observatory, 950 North Cherry Avenue, Tucson, AZ, USA aut NATIONALLICENCE 700 1- Pevtsov A. National Solar Observatory, 88349, Sunspot, NM, USA aut NATIONALLICENCE 700 1- Harvey J. National Solar Observatory, 950 North Cherry Avenue, Tucson, AZ, USA aut NATIONALLICENCE 700 1- Toussaint R. National Solar Observatory, 950 North Cherry Avenue, Tucson, AZ, USA aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 272/2(2011-09-01), 229-242 0038-0938 272:2<229 2011 272 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer