Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1744b&link_type=abstract
American Astronomical Society, SPD meeting #42, #17.44; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Precise measurements of the disk integrated solar Ca II K and H lines play a critical role in many investigations of solar activity and studies related to solar irradiance variability. The Integrated Sunlight Spectrometer(ISS) operating at the National Solar Observatory at Kitt Peak (Arizona) since December 2006 is designed to obtain high spectral resolution (R = 300,000) observations of the Sun as a star in a broad range of wavelengths (350 nm -1100 nm). The ISS is one of three instruments, with the Vector Spectro-Magnetograph (VSM) and the Full Disk Patrol (FDP), comprising the Synoptic Optical Long-term Investigations of the Sun (SOLIS) - a synoptic facility for solar observations operating at NSO/Kitt Peak. The ISS takes daily observations of solar spectra in nine spectral bands, including the Ca II K and H lines. We describe recent improvements in data reduction of Ca II K and H observations, and present time variations of parameters derived from the profiles of these spectral lines. Some properties of these time series are also discussed.
Bertello Luca
Harvey Jack W.
Pevtsov Alexander
Pietarila Anna
Solis Team
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