Definition of colour codes of solar cycle phases (see Fig. 5).
|Colour||From||To||α factors used|
|Red||Launch NOAA-16 (2001)||Launch NOAA-18 + 6 months (2005)a||α 1 N16|
|Green||Launch NOAA-17 (2002)||Launch MetOp-02 + 6 months (2007)||α 1 N17|
|Yellow||Launch NOAA-18 (2005)||Launch NOAA-19 + 6 months (2009)||α 1 N18,|
|Turquoise||Launch MetOp-02 (2007)||Launch MetOp-01 + 6 months (2013)||α 1 M02, α 2 N17|
6 months is added to the date of launch of the satellite defining the end of a period. This is because Sandanger et al. (2015) used one year of data from the new satellites to calibrate the old satellites and placed the calibration α factor in the middle of the respective 1-year period.
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