Comparison of calibration methods and criteria.
|Asikainen & Mursula (2011) and Asikainen et al. (2012)||Sandanger et al. (2015)|
|α Factors provided for channelsa||P1–P3||P1–P5|
|Separation in space between satellites||<1° magnetic latitude and longitude at foflb and <10% relative difference in L-value||Only compare satellites with <1 h separation in MLT|
|Separation in time between comparable satellites||<30 s||–|
|Data used||Instantaneous measurements (2 s resolution)||Mean value of one month of data from whole orbit|
|Number of months data from new satellite is considered non-degraded||5||12|
|Method for obtaining time evolution||Linear, 2nd order, 3rd order, PCHIPc fit with α vs. time, or as a function of ap index||Iteration method using α vs. accumulated corrected integral flux|
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