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Solar energetic particle propagation in wave turbulence and the possibility of wave generation
(IOP Publishing, 2019)
A complete theory for the complex interaction between solar energetic particles (SEPs) and the turbulent interplanetary magnetic field remains elusive. In this work we aim to contribute to such a theory by modeling the ...
Numerical integration of stochastic differential equations: a parallel cosmic ray modulation implementation on Africa’s fastest computer
(Elsevier, 2019)
Three-dimensional studies of the transport and modulation of cosmic ray particles in turbulent astrospheres require large-scale simulations using specialized scientific codes. Essentially, a multi-dimensional Fokker-Planck ...
Toward a greater understanding of the reduction of drift coefficients in the presence of turbulence
(IOP Publishing, 2017)
Drift effects play a significant role in the transport of charged particles in the heliosphere. A turbulent magnetic field is also known to reduce the effects of particle drifts. The exact nature of this reduction, however, ...
The re-acceleration of galactic electrons at the heliospheric termination shock
(IOP Publishing, 2017)
Observations by the Voyager spacecraft in the outer heliosphere presented several challenges for the paradigm of diffusive shock acceleration (DSA) at the solar wind termination shock (TS). In this study, the viability of ...
Energy spectra of carbon and oxygen with HELIOS E6: radial gradients of anomalous cosmic ray oxygen within 1 AU
(EDP Sciences, 2018)
Context. Anomalous cosmic rays (ACRs) are well-suited to probe the transport conditions of cosmic rays in the inner heliosphere.We
revisit the HELIOS data not only in view of the upcoming Solar Orbiter experiment but also ...
Proton fluxes measured by the PAMELA experiment from the minimum to the maximum solar activity for solar cycle 24
(IOP Publishing, 2018)
Precise measurements of the time-dependent intensity of the low-energy (<50 GeV) galactic cosmic rays (GCRs)
are fundamental to test and improve the models that describe their propagation inside the heliosphere. In ...
Spectral index of solar cosmic-ray flux from the analysis of ground-level enhancements
(Elsevier, 2016)
In this work we analyze the ground-level enhancement of the cosmic-ray intensity due to solar energetic particles as observed on 29 September 1989, by using two pairs of standard and lead-free neutron monitors. This enables ...
New local interstellar spectra for protons, helium and carbon derived from PAMELA and Voyager 1 observations
(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 ...
Non-axisymmetric perpendicular diffusion of charged particles and their transport across tangential magnetic discontinuities
(IOP Publishing, 2016)
We investigate the transport of charged particles across magnetic discontinuities, focusing specifically on stream interfaces associated with co-rotating interaction regions in the solar wind. We argue that the magnetic ...
On the effects of pickup ion-driven waves on the diffusion tensor of low-energy electrons in the heliosphere
(IOP Publishing, 2017)
The effects of Alfvén cyclotron waves generated due to the formation in the outer heliosphere of pickup ions on the transport coefficients of low-energy electrons is investigated here. To this end, parallel mean free path ...