Time-Dependent Cosmic-Ray Modulation with Voyager Magnetic Data as a Measure of Scattering

1993 ◽  
Vol 13 (6) ◽  
pp. 298
Author(s):  
J.S. Perko
Keyword(s):  
Cosmic Ray ◽  
Time Dependent ◽  
Magnetic Data ◽  
Cosmic Ray Modulation

scholarly journals Modelling cosmic ray intensities along the Ulysses trajectory

2005 ◽  
Vol 23 (3) ◽  
pp. 1061-1070 ◽  
Author(s):  
D. C. Ndiitwani ◽  
S. E. S. Ferreira ◽  
M. S. Potgieter ◽  
B. Heber
Keyword(s):  
Transport Model ◽  
Solar Maximum ◽  
Cosmic Ray ◽  
Time Dependent ◽  
Global Changes ◽  
Cosmic Ray Modulation ◽  
Magnetic Field Magnitude ◽  
Additional Reduction ◽  
Charge Sign ◽  
Inner Heliosphere

Abstract. Time dependent cosmic ray modulation in the inner heliosphere is studied by comparing results from a 2-D, time-dependent cosmic ray transport model with Ulysses observations. A compound approach, which combines the effects of the global changes in the heliospheric magnetic field magnitude with drifts to establish a realistic time-dependence, in the diffusion and drift coefficients, are used. We show that this model results in realistic cosmic ray modulation from the Ulysses launch (1990) until recently (2004) when compared to 2.5-GV electron and proton and 1.2-GV electron and Helium observations from this spacecraft. This approach is also applied to compute radial gradients present in 2.5-GV cosmic ray electron and protons in the inner heliosphere. The observed latitude dependence for both positive and negative charged particles during both the fast latitude scan periods, corresponding to different solar activity conditions, could also be realistically computed. For this an additional reduction in particle drifts (compared to diffusion) toward solar maximum is needed. This results in a realistic charge-sign dependent modulation at solar maximum and the model is also applied to predict charge-sign dependent modulation up to the next expected solar minimum.

Time-dependent cosmic ray modulation

2011 ◽  
Vol 47 (9) ◽  
pp. 1529-1537 ◽  
Author(s):  
R. Manuel ◽  
S.E.S. Ferreira ◽  
M.S. Potgieter ◽  
R.D. Strauss ◽  
N.E. Engelbrecht
Keyword(s):  
Cosmic Ray ◽  
Time Dependent ◽  
Cosmic Ray Modulation
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