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Fig. 2


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Scatter plots of daily SOHO/SEM 26-34 nm EUV flux versus (a) the F10.7 index and versus (b) the S index during the solar cycle 23; the parameter r is the correlation coefficient between the EUV flux and the indices. (c) Variations of mean midday foF2 at Kokubunji; the red line for observed values, the blue line for F10.7 fitted values, and the grey line for the S index fitted values with 1–day lag of foF2 to S being included; r is the correlation coefficient between observed and fitted foF2. (d) Difference between observed and F10.7 fitted foF2; the parameter STD is the standard deviation of the difference. (e) Same as Figure 2d but for the S index fitted foF2.

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