Search Results - "Burger, R. A."

MODELING DRIFT ALONG THE HELIOSPHERIC WAVY NEUTRAL SHEET by BURGER, R. A

“…Drift along the wavy heliospheric neutral sheet is believed to play an important role in cosmic-ray modulation and can explain the peaked versus flat intensity…”
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A general time-dependent stochastic method for solving Parker's transport equation in spherical coordinates by Pei, C., Bieber, J. W., Burger, R. A., Clem, J.

“…We present a detailed description of our newly developed stochastic approach for solving Parker's transport equation, which we believe is the first attempt to…”
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Reduction of Drift Effects due to Solar Wind Turbulence by Burger, R. A, Visser, D. J

“…Gradient and curvature drift play a key role in the modulation of cosmic rays. Reduction in the drift coefficient due to turbulence has been demonstrated…”
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Rigidity dependence of cosmic ray proton latitudinal gradients measured by the Ulysses spacecraft: Implications for the diffusion tensor by Burger, R. A., Potgieter, M. S., Heber, B.

“…The latitudinal gradient of cosmic ray protons observed by Ulysses during September 1994 to July 1995 is small, and it increases as function of rigidity up to…”
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Suppression of Particle Drifts by Turbulence by Minnie, J, Bieber, J. W, Matthaeus, W. H, Burger, R. A

“…We present results from direct numerical simulations showing the suppression of the large-scale drift motion of an ensemble of charged particles in a…”
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A Fisk-Parker Hybrid Heliospheric Magnetic Field with a Solar-Cycle Dependence by Burger, R. A, Krüger, T. P. J, Hitge, M, Engelbrecht, N. E

“…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…”
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Cosmic ray diffusion tensor throughout the heliosphere by Pei, C., Bieber, J. W., Breech, B., Burger, R. A., Clem, J., Matthaeus, W. H.

“…We calculate the cosmic ray diffusion tensor based on a recently developed model of magnetohydrodynamic (MHD) turbulence in the expanding solar wind…”
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When do particles follow field lines? by Minnie, J., Matthaeus, W. H., Bieber, J. W., Ruffolo, D., Burger, R. A.

“…We examine charged particle transport perpendicular to the large scale magnetic field. We find that the limit of an infinite parallel mean free path of…”
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Effects of various dissipation range onset models on the 26-day variations of low-energy galactic cosmic-ray electrons by Engelbrecht, N.E., Burger, R.A.

“…The effect of various models presented by Leamon et al. (2000) for the dissipation range cutoff wavenumber on the 26-day variations of galactic cosmic-ray…”
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On the Ability of Different Diffusion Theories to Account for Directly Simulated Diffusion Coefficients by Minnie, J, Bieber, J. W, Matthaeus, W. H, Burger, R. A

“…We present direct numerical simulations of charged-particle transport in a turbulent magnetic field. The magnetic field model used in the simulations consists…”
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A Simplified Ab Initio Cosmic-ray Modulation Model with Simulated Time Dependence and Predictive Capability by Moloto, K. D., Engelbrecht, N. E., Burger, R. A.

“…A simplified ab initio approach is followed to model cosmic-ray proton modulation, using a steady-state three-dimensional stochastic solver of the Parker…”
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Spectral Properties of the N Component of the Heliospheric Magnetic Field from IMP and ACE Observations for 1973–2020 by Burger, R. A., Nel, A. E., Engelbrecht, N. E.

“…Abstract We analyze the normal ( N ) component of the heliospheric magnetic field observed by the Interplanetary Monitoring Platform and the Advanced…”
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SENSITIVITY OF COSMIC-RAY PROTON SPECTRA TO THE LOW-WAVENUMBER BEHAVIOR OF THE 2D TURBULENCE POWER SPECTRUM by Engelbrecht, N. E., Burger, R. A.

“…ABSTRACT In this study, a novel ab initio cosmic ray (CR) modulation code that solves a set of stochastic transport equations equivalent to the Parker…”
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Toward a Greater Understanding of the Reduction of Drift Coefficients in the Presence of Turbulence by Engelbrecht, N. E., Strauss, R. D., Roux, J. A. le, Burger, R. A.

“…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…”
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A Generalized Fisk-type HMF: Implications of Spatially Dependent Photospheric Differential Rotation by Steyn, P. J., Burger, R. A.

“…The existence of a Fisk-type heliospheric magnetic field (HMF) has been debated ever since Fisk proposed an alternative to the traditional view of the HMF…”
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Revisiting the Revisited Palmer Consensus: New Insights from Jovian Electron Transport by Engelbrecht, N. Eugene, Vogt, Adrian, Herbst, Konstantin, Du Toit Strauss, R., Burger, R. A.

“…Abstract Novel insights into the behavior of the diffusion coefficients of charged particles in the inner heliosphere are of great importance to any study of…”
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AN AB INITIO MODEL FOR THE MODULATION OF GALACTIC COSMIC-RAY ELECTRONS by Engelbrecht, N E, Burger, R A

“…The modulation of galactic cosmic-ray electrons is studied using an ab initio three-dimensional steady state cosmic-ray modulation code in which the effects of…”
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The Effect of a Fisk-Type Heliospheric Magnetic Field on Cosmic-Ray Modulation by Burger, R. A, Hitge, M

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Early initiation of chemotherapy following complete resection of advanced ovarian cancer associated with improved survival: NRG Oncology/Gynecologic Oncology Group study by Tewari, K.S., Java, J.J., Eskander, R.N., Monk, B.J., Burger, R.A.

“…To determine whether time from surgery to initiation of chemotherapy impacts survival in advanced ovarian carcinoma. This is a post-trial ad hoc analysis of…”
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Toward a Realistic Diffusion Tensor for Galactic Cosmic Rays by Burger, R. A, Hattingh, M

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