2 documents found, page 1 of 1
Testing diffusion of cosmic rays in the heliosphere with proton and helium data...
Tomassetti, Nicola; Barão, Fernando; Bertucci, Bruna; Fiandrini, Emanuele; Figueiredo, José; Barreira, João; Orcinha, MiguelAfter six years of continuous observations in space, the Alpha Magnetic Spectrometer experiment has released new data on the temporal evolution of the proton and helium fluxes in cosmic rays. These data revealed that the ratio between proton and helium fluxes at the same value of rigidity $R=p/Z$ (momentum/charge ratio) is not constant at $R\lesssim$ 3 GV. In particular, the ratio is found to decrease steadily ...
Evidence for a Time Lag in Solar Modulation of Galactic Cosmic Rays
Tomassetti, Nicola; Orcinha, Miguel; Barão, Fernando; Bertucci, BrunaThe solar modulation effect of cosmic rays in the heliosphere is an energy-, time-, and particle-dependent phenomenon that arises from a combination of basic particle transport processes such as diffusion, convection, adiabatic cooling, and drift motion. Making use of a large collection of time-resolved cosmic-ray data from recent space missions, we construct a simple predictive model of solar modulation that d...