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Now showing items 1-10 of 12
A numerical study of cosmic proton modulation using AMS-02 observations
(IOP Publishing, 2019)
Since 2011 May, the Alpha Magnetic Spectrometer (AMS-02) on board the International Space Station has provided monthly cosmic proton fluxes for various low-rigidity levels (P<50 GV). These precise measurements, in terms ...
The effect of a dynamic inner heliosheath thickness on cosmic-ray modulation
(IOP Publishing, 2015)
The time-dependent modulation of galactic cosmic rays in the heliosphere is studied over different polarity cycles by
computing 2.5 GV proton intensities using a two-dimensional, time-dependent modulationmodel. By ...
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 ...
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 ...
Perpendicular diffusion of solar energetic particles: model results and implications for electrons
(IOP Publishing, 2017)
The processes responsible for the effective longitudinal transport of solar energetic particles (SEPs) are still not completely understood. We address this issue by simulating SEP electron propagation using a spatially 2D ...