SYSTEMATIC INVESTIGATION OF SOLAR MODULATION OF GALACTIC PROTONS FOR SOLAR CYCLE 23 USING A MONTE CARLO APPROACH WITH PARTICLE DRIFT EFFECTS AND LATITUDINAL DEPENDENCE

Journal Article · Wed Feb 01 04:00:00 EST 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/745/2/132· OSTI ID:22011902

Bobik, P; Kudela, K; Boella, G; Boschini, M J; Consolandi, C; Torre, S Della; Gervasi, M; Grandi, D; Pensotti, S; Rancoita, P G; Tacconi, M ^[1]

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1. Istituto Nazionale di Fisica Nucleare, INFN, Milano-Bicocca, I-20126 Milano (Italy)

A propagation model of galactic cosmic protons through the heliosphere was implemented using a two-dimensional Monte Carlo approach to determine the differential intensities of protons during solar cycle 23. The model includes the effects due to the variation of solar activity during the propagation of cosmic rays from the boundary of the heliopause down to Earth's position. Drift effects are also accounted for. The simulated spectra were found to be in agreement with those obtained from experimental observations carried out by the BESS, AMS, and PAMELA collaborations. In addition, the modulated spectrum determined with the present code for the year 1995 exhibits the latitudinal gradient and equatorial southward offset minimum found by the Ulysses fast scan in 1995.

• OSTI ID: 22011902
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 745; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COMPUTERIZED SIMULATION
COSMIC PROTONS
HELIOSPHERE
MONTE CARLO METHOD
SOLAR CYCLE
SOLAR WIND
SUN
TWO-DIMENSIONAL CALCULATIONS