Green and Red Coronal Line Data Explored Over the Period of about 6 Last Activity Cycles with Wavelet Methods and Recurrence Plots

Continuous monthly and daily data sets of the whole disc green and red line coronal emission (Fe XIV 530.3 nm, FeX 637.4 nm) covering the period of about 6 last activity cycles has been studied with nonlinear tools to find the periodicity characteristics and phase relationships between them and different solar activity indices. We have used wavelet scalograms and wavelet coherence diagrams which are powerful and sensitive methods for testing time series and cross recurrence plots and recurrence quantifications which give useful methods of visualizing and analyzing both linear and nonlinear time series data. We have compared the green-line data from Norikura and Kislovodsk Observatories,intensities registered by several coronographs and converted to the common photometric scale of Pic du Midi, intensities from several observatories converted to the photometric scale of Lomnicky Stit and published in the form of the rescaled coronal index with cosmic ray intensity, sunspot numbers and solar radio flux registered at different frequencies in Sagamore, Ottawa/Penticon, Nagoya/Toyokava, Hiraiso and Torun, which have been treated as reference data. We have also compared red and green line monthly intensities registered in Kislovodsk coronal station. Analyses used show that variability of the data set converted to the common photometric scale of Pic du Midi and time series from Kislovodsk are closest to the solar indices and radio flux data.