0 25 50 75 100 125 150 175 200 225 SUNSPOT NUMBER, W
Fig. 2.46.3. The expected ratios Adr/ Acd , for R=3, 1, and 0.3 GV in dependence of sunspot number W and derived from Burger and Potgieter (1999) by taking into account Eq. 2.45.6 (in Section 2.45.3). According to Dorman et al. (2005c).
The dependences shown in Fig. 2.46.3 can be approximated as (here Acd is the amplitude of convection-diffusion modulation relative to the intensity out of the Heliosphere):
Acd (R = 3GV) with correlation coefficient 0.996;
Acd (R = 1.0GV) with correlation coefficient 0.975;
Acd ( = 0-3GV) with correlation coefficient 0.950.
2.46.4. The satellite proton data and their corrections on solar CR increases and jump in December 1995
We analyze the following data: IMP-8 monthly data of proton fluxes with kinetic energy Ek > 106 MeV (R > 0.458 GV) from October 1973 to December 1999 (http://data.ftecs.com/archive/imp_cpme/) and GOES daily data of proton fluxes from January 1986 to December 1999 (http://spidr.ngdc.noaa.gov/spidr/) with kinetic energies Ek > 100 MeV (R > 0.444 GV), Ek > 60 MeV (R > 0.341 GV), Ek > 30 MeV (R > 0.239 GV), Ek > 10 MeV (R > 0.137 GV), Ek > 5 MeV (R > 0.097 GV), as well as fluxes in intervals 60-100, 30-60, 10-30, and 5-10 MeV.
The first problem is that the original GOES data contain many increases caused by SEP events. To exclude these days we sorted daily data for each month and determined the averages from ten minimal, ten middle, and ten maximal daily values. In the present paper we used averages from ten minimal daily values for each month. Even by this method the influence of great solar energetic particle events was not totally eliminated (e.g., as in September 1989). These months have been excluded from our analysis. Then, we determined 11-months moving averages.
The second problem is that the original GOES data contain a jump in December 1995. To exclude this jump we compared GOES data for Ek > 100 MeV with IMP-8 monthly data for Ek > 106 MeV and estimated the value of jump as 0.006 proton.cm-2.sec-1.ster-1. For Ek > 60, > 30, > 10, and > 5 MeV, the value of the jump is 0.012, 0.025, 0.035, 0.040 proton.cm-2.sec-1.ster-1, respectively.
In Fig. 2.46.4 the corrected data of IMP-8 data of proton intensities with energy Ek > 106 MeV are shown.
Was this article helpful?