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All issues Volume 6 (2016) J. Space Weather Space Clim., 6 (2016) A32 Full HTML

Table 1.

(Upper panel) Summary of periods at which ratios of PREMOS-A:PREMOS-B were calculated, and (lower panel) the subsequent relative difference of TSI, in W m−2, between PREMOS-B and SOHO/VIRGO relative to groups 7 and 8 (see also Fig. 4). All uncertainties are stated for confidence intervals of 68%.

Point N 1 2 3 4 5 6
Date 06/08/2010 07/09/2010 12/09/2010 19/09/2010/ 24/09/2010 29/09/2010/
Exp. time A, days 1.91 2.50 4.89 8.44 10.71 12.31
Exp. time B, days 0.02 0.05 0.08 0.12 0.15 0.44
N observations 48 45 45 48 48 48
Ratio, A:B 0.99599 0.99601 0.99614 0.99620 0.99615 0.99610
Correction1, B, ppm 1.5 4.2 6.9 9.7 12.5 35.6
Ratio2, A:Bcorr 0.99599 0.99602 0.99615 0.99621 0.99616 0.99613
Ratio-68% confidence interval, ppm 59.6 238.8 310.6 73.4 56.2 77.3
Standard error on mean, ppm 8.6 34.5 44.8 10.6 8.1 11.2
Bootstrap-68% confidence interval, ppm3 8.4 34.9 44.7 10.6 7.9 11.2
Point N 7 84 9 10 11 12 9–12 mean
Date 31/10/2011 09/07/2012 14/02/2014 21/02/2014 26/02/2014 01/03/2014
Exp. time B 1.91 2.50 4.89 8.44 10.71 12.31
N observations 43 37 43 44 45 45
Δ(PR − B(N − 7) − VIR(N − 7))5 0.00 ± 0.02 – 0.12 ± 0.06 0.12 ± 0.02 0.12 ± 0.01 0.11 ± 0.02 0.12 ± 0.026
Δ(PR − B(N − 8) − VIR(N − 8)) – 0.00 ± 0.05 0.04 ± 0.06 0.05 ± 0.02 0.04 ± 0.01 0.03 ± 0.02 0.04 ± 0.06
1

Correction of PREMOS-B values using the 81.7 ppm per exposure day from Schmutz et al. (2013) with an estimated 10% uncertainty.

2

These ratios are applied to all calculations and shown in Figures 2 and 3.

3

Confidence intervals are calculated through bootstrapping and, from random sampling, contain the 10% estimated uncertainty on the 81.7 ppm per exposure day correction applied to PREMOS-B; they have a Gaussian distribution.

4

We note that the same exposure periods in PREMOS-B with 48 exposures that go in to calculating the ratios PREMOS-A:PREMOS-B are not made contiguously for group 8. Therefore, we consider the group which has the majority of observations here.

5

These are the values plotted in the lower panels of Figure 4.

6

The weighted mean of groups 9–12; the uncertainty is derived from the uncertainty on 7 and 8 each combined in quadrature sum with the combined weighted uncertainty on 9–12, i.e. by inverse of the standard error on each point.

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