Browsing Faculty of Natural and Agricultural Sciences by Author "20056950 - Bisschoff, Driaan"
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The heliospheric modulation of electrons and positrons over a complete solar cycle
Aslam, O.P.M.; Bisschoff, Driaan; Potgieter, Marius S. (Sissa Medialab, 2019)The solutions of a comprehensive three-dimensional drift model are compared to PAMELA and AMS-02 spectra of electrons and positrons in order to describe and understand their different modulation down to 1 MeV. This is ... -
Implications of Voyager 1 observations beyond the heliopause for the local interstellar electron spectrum
Bisschoff, D.; Potgieter, M.S. (IOP Publishing, 2014)Cosmic-ray observations made by the Voyager 1 spacecraft outside the dominant modulating influence of the heliosphere finally allow the comparison of computed galactic spectra with experimental data at lower energies. These ... -
Isotope solar modulation with the PAMELA experiment 2019
Munini, Riccardo; Aslam, O.P.M.; Bisschoff, D.; Potgieter, M.S. (Sissa Medialab, 2019)The satellite-borne PAMELA experiment was launched on the 15th June 2006 from the Baikonur cosmodrome. Since then and until January 2016 PAMELA made high-precision measurements of the charged component of cosmic-rays ... -
Modeling of heliospheric modulation of cosmic-ray positrons in a very quiet heliosphere
Aslam, O.P.M.; Bisschoff, D.; Potgieter, M.S.; Boezio, M.; Munini, R. (IOP Publishing, 2019)Heliospheric modulation conditions were unusually quiet during the last solar minimum activity between solar cycles 23 and 24. Fortunately, the PAMELA space experiment measured 6 month–averaged Galactic positron spectra ... -
New local interstellar spectra for protons, helium and carbon derived from PAMELA and Voyager 1 observations
Bisschoff, D.; Potgieter, M.S. (Springer, 2016)With the cosmic ray observations made by the Voyager 1 spacecraft outside the dominant modulating influence of the heliosphere, the comparison of computed galactic spectra with experimental data at lower energies is finally ... -
New very local interstellar spectra for electrons, positrons, protons, and light cosmic ray nuclei
Bisschoff, D.; Potgieter, M.S.; Aslam, O.P.M. (IOP Publishing, 2019)The local interstellar spectra (LISs) for galactic cosmic rays (CRs) cannot be directly observed at the Earth below certain energies, because of solar modulation in the heliosphere. With Voyager 1 crossing the heliopause ... -
Solar modulation of cosmic ray positrons in a very quiet heliosphere
Potgieter, Marius S.; Vos, Etienne E.; Bisschoff, Driaan; Raath, Jan-Louis; Boezio, Mirko (PoS, 2017)Since the beginning of the space exploration era, solar activity was observed at its lowest level during 2006 to 2009. During this period, the PAMELA space experiment observed spectra for galactic cosmic rays, specifically ... -
The solar modulation of protons and anti-protons
Aslam, O.P.M.; Bisschoff, D.; Potgieter, M. (Sissa Medialab, 2019)A comprehensive, three-dimensional drift model is used to study the solar modulation of cosmic-ray protons and particularly of anti-protons. Spectra for protons and anti-protons from 10 MeV to 70 GeV are computed based on ... -
Time dependence of the flux of helium nuclei in cosmic rays measured by the PAMELA experiment between 2006 July and 2009 December
Marcelli, N.; Aslam, O.P.M.; Bisschoff, D.; Ngobeni, M.D.; Potgieter, M.S. (IOP, 2020)Precise time-dependent measurements of the Z = 2 component in the cosmic radiation provide crucial information about the propagation of charged particles through the heliosphere. The PAMELA experiment, with its long flight ... -
Time dependence of the proton and helium fluxes measured by PAMELA during solar minimum (2006 - 2009)
Marcelli, Nadir; Aslam, O.P.M.; Bisschoff, D.; Potgieter, M.S.; Boezio, M. (Sissa Medialab, 2019)Precision measurements of the Z = 2 component in the cosmic radiation provide crucial information about both the origin and propagation of the helium nuclei in cosmic rays inside the Galaxy. Moreover, the precise measurement ...