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A Fisk-Parker hybrid heliospheric magnetic field with a solar-cycle dependence
(IOP Publishing, 2008)
We present a refinement of the Fisk-Parker hybrid field of Burger and Hitge which now includes a region bordering the solar rotational equator where magnetic field footpoint motion occurs only through diffusive reconnection. ...
On the effects of dynamical turbulence on the perpendicular diffusion of low-energy cosmic ray electrons
(Elsevier, 2020)
Diffusion perpendicular to the heliospheric magnetic field plays an integral role in the transport of charged particles in the heliosphere. In this study the perpendicular diffusion coefficient of low-energy cosmic ray ...
Solar wind turbulence: connections with energetic particles
(Elsevier, 2021)
For the solar wind, a wealth of observational evidence indicates that turbulence is an important dynamical process for velocity (v), magnetic (b), and other related fluctuations at MHD (fluid) scales. Here we review such ...
Cosmic-ray acceleration and escape from post-adiabatic supernova remnants
(EDP Sciences, 2020)
Context. Supernova remnants are known to accelerate cosmic rays on account of their nonthermal emission of radio waves, X-rays,
and gamma rays. Although there are many models for the acceleration of cosmic rays in supernova ...
Towards a deeper understanding of historic cosmic ray modulation during solar cycle 20
(Elsevier, 2020)
Given recent successes in modelling the transport of cosmic rays (CRs) in the heliosphere from first principles, taking into account the behaviour of heliospheric turbulence quantities and their influence on the transport ...
Correlation of long-term cosmic-ray modulation with solar activity parameters
(IOP Publishing, 2019)
In this work, we analyze the long-term cosmic-ray modulation observed by the Hermanus neutron monitor, which is the detector with the longest cosmic-ray record, from 1957 July. For our study we use the force-field approximation ...
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 ...
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, ...
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 ...