Title: Ca II K 1-A Emission Index Composites,
Abstract: We describe here a procedure to combine measurements in the 393.37 nm Ca II K
spectral line taken at different observatories. Measurements from the National
Solar Observatory (NSO) Integrated Sunlight Spectrometer (ISS) on the Synoptic
Optical Long-term Investigations of the Sun (SOLIS) telescope, the NSO/Sac Peak
Ca II K-Line Monitoring Program, and Ca II K filtergrams from Kodaikanal Solar
Observatory (KKL) are merged together to create a pair of composites of the Ca
II K 1-A emission index. These composites are publicly available from the SOLIS
website at this http URL.