Modeling the acceleration and modulation of anomalous cosmic ray oxygen

Strauss, R. D.; Potgieter, M. S.; Ferreira, S. E. S.

doi:10.1016/j.asr.2011.03.014

Cited by 11 publications

(9 citation statements)

References 56 publications

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“…Ferreira et al, 2001;Potgieter and Nndanganeni, 2013) or the pick-up ion source for the anomalous component (e.g. Strauss et al, 2011), but for this study J source = 0. The diffusion tensor K S consists of a diffusion coefficient K || that is parallel to the average HMF, a radial perpendicular diffusion coefficient K \r and a polar perpendicular diffusion coefficient K \h (e.g.…”

Section: The Numerical Modulation Modelmentioning

confidence: 99%

Modelling the effects of scattering parameters on particle-drift in the solar modulation of galactic cosmic rays

Ngobeni

Potgieter

2015

Advances in Space Research

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Section: The Numerical Modulation Modelmentioning

confidence: 99%

Modelling the effects of scattering parameters on particle-drift in the solar modulation of galactic cosmic rays

Ngobeni

Potgieter

2015

Advances in Space Research

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“…This width is a determining factor in the modulation of galactic electrons between 1 MeV and 100 MeV [e.g. 7], and crucially important for the existence of the anomalous component [9].…”

Section: Modulation Modelsmentioning

confidence: 99%

The First Very Local Interstellar Spectra for Galactic Protons, Helium and Electrons

Potgieter¹,

Vos²,

Nndanganeni³

2014

Astroparticle, Particle, Space Physics and Detectors for Physics Applications

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Low-energy galactic electrons (1-300 MeV) are significantly modulated, almost extraordinary, in the heliosheath in contrast to the rest of the heliosphere, indicating that modulation conditions in the heliosheath are quite different for these particles. Lowenergy protons and helium (1-100 MeV/nuc), on the other hand, are dominated by the anomalous component which originates inside the inner heliosheath so that the very local interstellar spectra for these particles had been properly concealed until recently. Basic mechanisms responsible for these effects are been studied with comprehensive numerical models for the transport of these particles, from the modulation boundary, through the heliosheath, across the solar wind termination shock, up to Earth. Together with measurements made by the two Voyager spacecraft, now with Voyager I beyond the heliopause, possibly entering the very local interstellar medium, it is possible to determine heliopause spectra at these low energies for the first time. Together with PAMELA spectra observed at Earth, these heliopause spectra can be determined accurately up to 50 GeV. Such spectra should be considered as the lowest possible very local interstellar spectra for galactic electrons, protons and helium, and of great relevance to solar modulation and galactic propagation studies.

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“…averaged particle drift velocity Adiabatic energy change is one of the four major modulation mechanisms and is crucially important for galactic CR modulation in the inner heliosphere (see the illustrations by Strauss, Potgieter and Ferreira, 2011;.…”

Section: Numerical Model and Modulation Parametersmentioning

confidence: 99%

“…For elaborated discussions on this issue, see also Strauss, Potgieter, and Ferreira (2011) and Ngobeni and Potgieter (2010). The numerical procedure used to solve Equation (1) was described by Ferreira and Potgieter (2002) and Ferreira et al (2001Ferreira et al ( , 2003 and Nkosi, Potgieter and Ferreira (2008).…”

Section: Numerical Model and Modulation Parametersmentioning

confidence: 99%

Modulation of Galactic Protons in the Heliosphere During the Unusual Solar Minimum of 2006 to 2009

et al. 2013

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The last solar minimum activity period, and the consequent minimum modulation conditions for cosmic rays, was unusual. The highest levels of galactic protons were recorded To simulate this effect, the rigidity dependence of the diffusion coefficients had to decrease significantly below ~3 GeV. The modulation minimum period of 2009 can thus be described as relatively more 'diffusion dominated' than previous solar minima. However, we illustrate that drifts still had played a significant role but that the observable modulation effects were not as well correlated with the waviness of the heliospheric current sheet as before. Protons still experienced global gradient and curvature drifts as the heliospheric magnetic field had decreased significantly until the end of 2009, in contrast to the moderate decreases observed during previous minimum periods. We conclude that all modulation processes contributed to the observed increases in the proton spectra for this period, exhibiting an intriguing interplay of these major mechanisms.

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Modeling the acceleration and modulation of anomalous cosmic ray oxygen

Cited by 11 publications

References 56 publications

Modelling the effects of scattering parameters on particle-drift in the solar modulation of galactic cosmic rays

Modelling the effects of scattering parameters on particle-drift in the solar modulation of galactic cosmic rays

The First Very Local Interstellar Spectra for Galactic Protons, Helium and Electrons

Modulation of Galactic Protons in the Heliosphere During the Unusual Solar Minimum of 2006 to 2009

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