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Table 1 Two-dimensional regression analysis: coefficients for Equation 1

From: Noctilucent clouds observed from the ground: sensitivity to mesospheric parameters and long-term time series

Time series Year range b1number/year b2number/Lyα b 3 Lag (years)
Moscow relative NLC number 1990 to 2013 −0.001 ± 0.009 −0.15 ± 0.10 1.1 ± 0.5 0
Moscow relative NLC brightness 1990 to 2013 −0.040 ± 0.241 −3.48 ± 2.52 23.7 ± 12.4 0
Lithuanian relative NLC number 1992 to 2013 0.216 ± 0.317 −5.27 ± 3.15 50.3 ± 15.0 1
Canadian relative NLC number 1990 to 2013 0.048 ± 0.310 0.66 ± 3.13 10.9 ± 15.5 2
PMC frequency 1990 to 2013 −0.030 ± 0.035 −0.68 ± 0.36 5.0 ± 1.8 0
PMC albedo 1990 to 2013 −0.009 ± 0.031 −0.13 ± 0.28 5.9 ± 1.5 2
  1. The table contains the results of ground-based NLC observations and of the space-borne PMC measurements at 50 to 64°N (the latter are consistent with DeLand and Thomas (2014) and are provided by M. DeLand). Lag equal to 0 means that the NLC/PMC cycle is exactly in the anti-correlation with the solar cycle, while positive lag means that the maximum of NLC/PMC is delayed with respect to minimum of Ly alpha flux.