Long-term CR variations according to IMP-8 data on electrons, protons, He, CNO and Z > 8 nuclei during 1973-2000: properties of the Heliosphere and their change in solar cycle

We analyzed available from Internet IMP-8 daily data for 1973-2000 on electron fluxes in ranges 0.7-2.0, 2-12 and 12-50 MeV; proton fluxes in ranges 11.24-12.62, 12.62-16.18, 16.18-20.00, 20.00-29.75, 29.75-40.10, 40.10-50.90, 50.90-62.55, 62.55-74.50, 74.50-94.78, and > 106 MeV as well as in extended ranges 11.24-20.00, 20.00-50.90, 50.90-94.78 MeV; alpha-particle fluxes in ranges 10.90-12.89, 12.89-16.35, 16.35-19.95, 19.95-25.36, 30.61-42.03, 42.03-55.40, 55.40-69.64, 69.64-84.32, 84.32-94.81 MeV/nucleon as well as in extended ranges 10.90-25.36, 30.61-55.40, 55.40-94.81 MeV/nucleon; fluxes of CNO and Z > 8 nuclei with energies E < 80 MeV/nucleon and E > 80 MeV/nucleon. As the first step we excluded periods with great CR increases caused by particle acceleration in solar flare events and other processes. Then we determined monthly averaged fluxes as well as 5 months and 11 months smoothed data. We corrected these data on drift effects according to the procedure described in Dorman (2004) in dependence of particle energies. Corrected on drifts proton fluxes we compare with expected according to convection-diffusion modulation for different values of X_o from 1 to 60 av. months (described in Dorman, 2001). By this way we can determine X_omax, at what the correlation coefficient reaches the maximum value. Then we determine the dimension of modulation region, the radial diffusion coefficient and transport path as well as expected CR intensity out of the modulation region and absolute CR modulation in the Heliosphere (relative to the CR intensity level in the interstellar space). References: Dorman L.I. ``Cosmic ray long-term variation: even-odd cycle effect, role of drifts, and the onset of cycle 23'', Adv. Space Res., 27, No. 3, 601-606, 2001. Dorman L.I. ``Expected relative role of drift and convection-diffusion mechanisms in global small energy cosmic ray modulation''. Paper, submitted on the Session D1.2 of COSPAR 2004, Paris, 2004.