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  • Models of the Moon Radiation Environment and a Comparison with the RADOM Experiment Data collected onboard the CHANDRAYYAN-1 mission

    Paper number

    IAC-09.A3.2INT.19

    Author

    Dr. Giovanni De Angelis, Istituto Superiore di Sanita' (ISS), Rome, Italy, Italy

    Coauthor

    Dr. Tsvetan P. Dachev, Bulgarian Academy of Sciences, Bulgaria

    Coauthor

    Dr. Borislav Tomov, Bulgaria

    Coauthor

    Mr. Yurii Matviichuk, Bulgaria

    Coauthor

    Mr. Plamen Dimitrov, Bulgaria

    Coauthor

    Prof. Frantisek Spurny, Nuclear Physics Institute, Czech Academy of Sciences, Czech Republic

    Year

    2009

    Abstract
    Radiation environmental models have been developed in the framework of the RADOM investigation that is onboard the CHANDRAYAAN-1 mission by the Indian Space Agency ISRO. Models for the Moon radiation environment already developed have been used to be compared with the data coming from the RADOM experiment: models of Galactic Cosmic Rays (GCR) and Solar Particle Events (SPE) primary particles impinging on the lunar surface, transported through the subsurface layers, with backscattering taken into account, and interacting with some described targets. The lunar surface and subsurface has been modeled as regolith and bedrock, with structure and composition taken from the results of the instruments of the Luna, Ranger, Lunar Surveyor and Apollo missions, as well as from groundbased measurements. In order to perform the comparison with the RADOM spacecraft data, the models have been set to a 100 km altitude circular orbit, to the actual mission time frame (both punctual and averaged data), and to the actual environmental shielding inside the spacecraft. As a preliminary comparison, RADOM data at 100 km altitude around the Moon give a mean flux for GCR of 2.29 particles/cm2*sec. If for the comparison the above model is used, rescaled for CHANDRAYAAN-1 orbital conditions and timeframe, with a shielding pattern of 0.45 g/cm2 on the 2π solid angle before the detector and more shielding on the other 2π solid angle at the back side of the detector, a value for GCR of 2.55 particles/cm2*sec is this way obtained. Further examples of comparisons between models and RADOM data will be hereby shown.
    
    Abstract document

    IAC-09.A3.2INT.19.pdf

    Manuscript document

    (absent)