Results 181 to 190 of about 13,753 (202)

Interplanetary acceleration of energetic particles at 1 and 5 AU

Astrophysics and Space Science, 1982
Energetic particle (0.1 to 100 MeV protons) acceleration is studied by using high resolution interplanetary magnetic field and plasma measurements at 1 AU (HEOS-2) and at ∼5 AU (Pioneer 10). Energy changes of a particle population are followed by computing test particle trajectories and the energy changes through the particle interaction with the time ...
X. Moussas, J. J. Quenby, J. F. Valdes Galicia   +2 more
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Charged particle acceleration processes in the interplanetary medium

Advances in Space Research, 1989
Abstract Selected aspects of energetic (>35 keV) ion acceleration processes in three regions of the heliosphere are reviewed: at interplanetary travelling shocks near 1 AU, in the outer heliosphere and in cometary environments. Clear examples of diffusive acceleration events at quasi-parallel shocks as well as of shock drift acceleration events at ...
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Particle acceleration by coronal and interplanetary shock waves

Advances in Space Research, 1982
Utilizing many years of observation from deep space and near-earth spacecraft a theoretical understanding has evolved on how ions and electrons are accelerated in interplanetary shock waves. This understanding is now being applied to solar flare-induced shock waves propagating through the solar atmosphere.
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Adiabatic Fermi acceleration of energetic particles between converging interplanetary shock waves

Journal of Geophysical Research, 1976
The process of adiabatic acceleration of relativistic cosmic rays between two converging shocks, through the first-order Fermi mechanism, to which the unusual ground level event (GLE) of August 4, 1972, was attributed earlier is examined quantitatively, the nature of interplanetary shock waves and their propagation being taken into account.
E. H. Levy, S. P. Duggal, M. A. Pomerantz   +2 more
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Particle acceleration in interplanetary shocks: Classification of energetic particle events and modeling

AIP Conference Proceedings, 2001
Gradual solar energetic particle events using data observed by EPAM (Electron, Proton, and Alpha Monitor), SWEPAM (Solar Wind Electron, Proton and Alpha Monitor) and Magnetic Field Experiment (MAG) on the ACE are studied. The energetic particle events are classified in four types according to the variance in the flux, the characteristic duration time ...
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Particle acceleration and MHD wave excitation upstream of interplanetary shocks

Advances in Space Research, 1984
The theory of diffusive shock acceleration and its application in interplanetary space are reviewed. Special emphasis is placed on the distinction between diffusive and shock-drift shock acceleration, on ion-excitation of MHD waves upstream of the shock and the resulting self-consistent configuration of waves and accelerated ions, and on the ...
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A theoretical perspective on particle acceleration by interplanetary shocks and the Solar Energetic Particle problem

Physics Reports, 2015
Abstract Understanding the physics of Solar Energetic Particle (SEP) events is of importance to the general question of particle energization throughout the cosmos as well as playing a role in the technologically critical impact of space weather on society.
Olga P. Verkhoglyadova, Gary P. Zank, Gang Li   +2 more
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Acceleration of low‐energy protons and alpha particles at interplanetary shock waves

Journal of Geophysical Research: Space Physics, 1983
We have investigated low‐energy protons and alpha particles in the energy range 30 keV/charge to 150 keV/charge associated with three different interplanetary shock waves in the immediate preshock and postshock region. The data were obtained with the Max‐Planck‐Institut/University of Maryland sensor system on ISEE 3.
M. Scholer, F. M. Ipavich, G. Gloeckler, D. Hovestadt   +3 more
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Particle Acceleration Processes in Interplanetary Space

1985
The preceeding chapters have been concerned mainly with multiple scattering, diffusion, and convective transport of particles. In passing, some processes of particle energy variations have been considered, such as adiabatic deceleration in expanding streams of magnetic inhomogeneities (§8,1, 12, 13) and in large-scale magnetic fields frozen into the ...
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Time-dependent Acceleration of Solar Wind Particles at Interplanetary Traveling Shocks

AIP Conference Proceedings, 2008
A time‐dependent focused transport model is used to model how solar wind protons are injected from the suprathermal tail of the solar wind distribution into diffusive shock acceleration at both a strong and a weak coronal mass ejection‐driven shock. It is discussed how the temporal evolution of the injection and acceleration process can result in solar
J. A. le Roux, Gang Li, Qiang Hu, Olga Verkhoglyadova, Gary P. Zank, R. P. Lin, J. Luhmann   +6 more
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