Results 181 to 190 of about 13,868 (214)

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 F Valdes Galicia, J J Quenby   +2 more
exaly   +2 more sources

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 ...
K Yamashita
exaly   +2 more sources

The structure and evolution of interplanetary shocks and the relevance for particle acceleration

Nuclear Physics, Section B, Proceedings Supplements, 1995
It is now widely accepted that interplanetary shocks initiated by coronal mass ejections play a dominant role in the generation of the vast majority of large solar energetic particle events. However, our understanding of the details of the acceleration process is far from complete.
exaly   +2 more sources

The acceleration of charged particles in interplanetary shock waves

Space Science Reviews, 1982
Consideration of the theoretical and observational literature on energetic ion acceleration in interplanetary shock waves is the basis for the present discussion of the shock acceleration of the solar wind plasma and particle transport effects. It is suggested that ISEE data be used to construct data sets for shock events that extend continuously from ...
M.E. Pesses, R.B. Decker, T.P. Armstrong
openaire   +1 more source

Acceleration in solar flares: Interacting particles versus interplanetary particles

Advances in Space Research, 1993
Abstract We study the properties of flare accelerated particles using gamma ray observations. We derive ion and electron energy spectra, electron to proton ratios, and numbers of interacting particles. We investigate the effects of the abundance variations implied by the gamma ray data on these parameters.
R. Ramaty, N. Mandzhavidze, B. Kozlovsky, J.G. Skibo   +3 more
openaire   +1 more source

Solar and interplanetary particle acceleration

Advances in Space Research, 2003
Abstract The nature and location of energetic particle acceleration (excluding planetary magnetospheres) in the inner heliosphere ( 1000 km/sec) coronal mass ejections is examined, but we find that they are not normally associated with relativistic energetic particle acceleration, although they may enhance the energy of particles already present in ...
openaire   +1 more source

Particle acceleration and Alfvén wave generation by an interplanetary shock

Astronomy Letters, 2016
Based on the event observed by ISEE 3 near the Earth’s orbit at 01:21 UT on April 5, 1979, we investigate the diffusive shock acceleration of ions and the generation of Alfven waves by accelerated particles near the quasi-parallel parts of interplanetary shock fronts within a quasi-linear approach.
E. G. Berezhko, S. N. Taneev
openaire   +1 more source

Fe/O Ratios in Interplanetary Shock Accelerated Particles

Space Science Reviews, 2007
It is widely accepted that diffusive shock acceleration is an important process in the heliosphere, in particular in producing the energetic particles associated with interplanetary shocks driven by coronal mass ejections. In its simplest formulation shock acceleration is expected to accelerate ions with higher mass to charge ratios less efficiently ...
H. V. Cane, I. G. Richardson, T. T. von Rosenvinge   +2 more
openaire   +1 more source

Interplanetary particle acceleration, modulation and drift

Reviews of Geophysics, 1979
This report is concerned mainly with the contribution of U. S. scientists, during the period 1975–1978, to the general area of particle acceleration and transport in the solar wind, excluding particles of solar origin. Other work is cited only when it bears directly on the subject being discussed.
openaire   +1 more source

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.
openaire   +1 more source