PLAGE AND ENHANCED NETWORK INDEXES DERIVED FROM CA-II-K SPECTROHELIOGRAMS

NSO Sacramento Peak Ca II K images are analyzed for the years 1992 thr ough September 1996 with about a 50% coverage,. The plage, decayed pla ge, enhanced network, and quiet-Sun features are identified on each im age with an algorithm that uses the criteria of intensity, size, and f illing factor. These algorithms can be adapted for analyzing spectrohe liograms from ground-based or space-based observatories. Plage and enh anced network indices, for these time periods, are shown. We present i ntensity contrasts for the plage, decayed plage, and enhanced network. We also find that these contrasts, which are an average of the struct ures intensity relative to the quiet Sun over the whole disk, remain e ssentially constant over the solar cycle.