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The drift modulation expected for different values of Adr can be estimated according to procedure described in Section 2.46.3.

2.46.6. Results for >106 and >100 MeVprotons (IMP-8 and GOES data)

In Fig. 2.46.10 we show dependences of correlation coefficient

between natural logarithm of 11-month moving averages IMP-8 data of proton intensities with energy Ek > 106 MeV (corrected by excluding months affected by SEP events (as shown in Fig. 2.46.4), and corrected also for drift effects with different amplitudes according to the procedure described in Section 2.46.5), with the value expected from convection-diffusion mechanism, by taking into account the diffusion time-lag (important for small energy particles observed on satellites).

Xo, AVERAGE MONTHS 0 5 10 15 20 25 30 35 40

Xo, AVERAGE MONTHS 0 5 10 15 20 25 30 35 40

—•—Adr=0

—■—Adr=0.05 —o—Adr=0.1

-*-Adr=0.2 -x-Adr=0.3

-Adr=0.4

---Adr=0.5 -*-Adr=0.6

Adr=0.7

Fig. 2.46.10. Correlation coefficient , Adr ) for 11-month moving averages of IMP-8

data of proton intensities with energy Ek > 106 MeV from October 1973 to December 1999, corrected for drift modulation with different amplitudes Adr from 0 to 0.7. From Dorman et al. (2005c).

Fig. 2.46.10. Correlation coefficient , Adr ) for 11-month moving averages of IMP-8

data of proton intensities with energy Ek > 106 MeV from October 1973 to December 1999, corrected for drift modulation with different amplitudes Adr from 0 to 0.7. From Dorman et al. (2005c).

From Fig. 2.46.10 it can be seen that Y((o,Adr ) reaches the greatest values for Adr ~ 0.1 (i.e. 10%) with maximum value 0.9128 at Xomax = 17 av. months, a little bigger than the value obtained for NM data by Dorman (2001), and Dorman et al. (2001a,b). About the same result was obtained for monthly data, but with smaller values of correlation coefficient (maximum value 0.8993 at Xomax = 18 av. months). In Fig. 2.46.11 is shown one result for GOES satellites. It can be seen that GOES data give about the same result as IMP-8 data, but with much bigger correlation coefficient.

Xo, AVERAGE MONTHS 0 5 10 15 20 25 30 35 40 45 50

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