Browsing Conference Papers - Potchefstroom Campus by Author "10060014 - Potgieter, Marthinus Steenkamp"
Now showing items 1-12 of 12
-
Acceleration of galactic electrons at the solar wind termination shock and Voyager 1 observations
Potgieter, Marius S.; Prinsloo, P. Lourens; Strauss, R. Du Toit (PoS, 2017)Diffusive shock acceleration (DSA) , as an acceleration process for G alactic electrons at the solar wind termination shock (TS) , is investigated with a comprehensive numerical model which ... -
Charge-sign dependent modulation of cosmic ray electrons and positrons up to extreme solar maximum conditions
Raath, J.L.; Potgieter, M.S. (PoS, 2017)The charge-sign dependent modulation of cosmic rays is an important topic in solar modulation studies, providing insights into gradient, curvature, and current sheet drifts. Such studies, at higher levels of solar activity, ... -
The combined modulation of Jovian and Galactic electrons in the heliosphere
Potgieter, Marius S.; Nndanganeni, Rendani R. (PoS, 2017)The propagation and modulation of electrons in the heliosphere play a significant role in improving our understanding and assessment of the competing processes of solar modulation. An in-house developed, full three-dimensional ... -
Constraints on the lepton content of PWN from the local CR positron spectrum
Büsching, I.; De Jager, O.C.; Potgieter, M.S.; Venter, C. (ICRC, 2008)Geminga is a nearby pulsar with an age of 3.42×105 yr and a spindown power of 3.2×1034 erg/s at present. B0656+14 has comparable spindown power, with an age of 1.11×105 yr and a distance of 290 pc. The winds of these ... -
A global view of the modulation of cosmic ray protons in the heliosphere for the solar minimum period up to 2009
Potgieter, M.S.; Vos, E.E. (IOP Publishing, 2016)The heliosphere was in a state of ideal solar minimum conditions for at least three years up to the end of 2009. During this period the highest ever recorded cosmic ray spectra were observed at the Earth. Fortunately, the ... -
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 ... -
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 ... -
Short-term variation in the galactic cosmic ray intensity measured with the PAMELA experiment
Munini, Riccardo; Potgieter, M.S.; Di Felice, Valeria; Boezio, M.; Adriani, O. (PoS, 2017)New results on the galactic cosmic ray (GCR) short-term intensity variation associated with Forbush decrease and co-rotating interaction regions (CIRs) measured by the PAMELA instrument between November 2006 and March ... -
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 ... -
Ten years of positron and electron solar modulation measured by the PAMELA experiment
Munini, Riccardo; Potgieter, M.S.; Raath, J.L.; De Felice, V.; Boezio, M. (PoS, 2017)The satellite-borne PAMELA experiment was launched on the 15th June 2006 from the Baikonur cosmodrome. Till January 2016 PAMELA has detected the charged component of cosmic-rays (CRs) over a wide energy range. Due to its ... -
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 ...