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Table 2 Estimated parameters for the smoothed f[2− 3 t] component model (winter)

From: Method for modeling of the components of ionospheric parameter time variations and detection of anomalies in the ionosphere

Time period Constant Parameters of the model for the smoothed component Parameters of the model for the first difference of the smoothed component
First parameter Second parameter Third parameter First parameter Second parameter Third parameter
03.01.1982–20.01.1982 16.832 −0.195 −0.1745 0.8029 −0.5443 −0.5505 0.4451
19.12.2011–08.01.2012 13.746 −0.1677 −0.1809 0.80866 −0.5567 −0.5744 0.42407
29.12.2012–24.01.2013 13.089 −0.3028 −0.3231 0.65231 −0.5858 −0.5936 0.39376
General model parameters (solar maximum) 16.00 −0.22 −0.22 0.77 −0.62 −0.63 0.36
22.01.1987–10.02.1987 10.688 −0.0931 −0.1326 0.84567 −0.4579 −0.4669 0.53618
15.01.2006–04.02.2006 11.042 −0.1716 −0.2479 0.7101 −0.7254 −0.7371 0.22256
09.02.2008–27.02.2008 10.576 −0.3156 −0.2979 0.62768 −0.7993 −0.7656 0.20138
General model parameters (solar minimum) 11.00 −0.19 −0.21 0.75 −0.62 −0.63 0.36