Results 231 to 240 of about 5,065 (261)

COSMIC RAY SOURCE AND SOLAR ENERGETIC PARTICLES

Problems of Atomic Science and Technology, 2023
The acceleration of particles to the high energy is one of the key issues of solar physics, cis-lunar irradiations, astrophysics, and astroparticle physics. With the development of space astronomy, people started to realize that plasma disturbances in solar flares, Earth’s magnetosphere, and interplanetary space can also produce a large population of ...
Cass??, M., Maslov, V.I.
openaire   +2 more sources

Solar energetic particles: Is there time to hide?

Radiation Measurements, 1999
In the large solar energetic particle (SEP) events that constitute a serious radiation hazard, particles are accelerated at shock waves driven out from the Sun by coronal mass ejections (CMEs). A self-regulating mechanism of wave formation by the streaming particles limits SEP intensities early in the event. Hazardous intensities do not occur until the
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Solar Energetic Particles

2010
Some observational aspects of solar energetic particles (SEPs) are briefly discussed. The shift from the flare paradigm of SEP origin through the two-class paradigm of impulsive and gradual SEP events to hybrid events is described. Comprehensive investigations of coronal mass ejections (CMEs) and solar energetic particles during the SOHO era have shown
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Element abundance and the physics of solar energetic particles

Frontiers in Astronomy and Space Sciences
The acceleration and transport of solar energetic particles (SEPs) cause their abundance, measured at a constant velocity, to be enhanced or suppressed as a function of the magnetic rigidity of each ion, and hence, of its atomic mass-to-charge ratio of A/Q. Ion charges, in turn, depend upon the source electron temperature.
Donald Reames
exaly   +4 more sources

Energetic particles in solar flares

AIP Conference Proceedings, 1979
The principal properties of energetic particles accelerated in solar flares are reviewed. Particular emphasis is placed on the high energy flare component whose acceleration is often referred to as second phase acceleration. Stochastic Fermi acceleration is treated analytically, and the results of the computation are compared with particle and gamma ...
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Solar Energetic Particle Studies

1983
As against the discussions of the galactic cosmic ray that we have had so far, we shall discuss the other component of cosmic rays namely the solar cosmic rays.
M. N. Vahia, S. Biswas
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Composition of energetic particles from solar flares

Advances in Space Research, 1994
We present a model for composition of heavy ions in the solar energetic particles (SEP). The SEP composition in a typical large solar particle event reflects the composition of the Sun, with adjustments due to fractionation effects which depend on the first ionization potential (FIP) of the ion and on the ratio of ionic charge to mass (Q/M).
Garrard, T. L., Stone, E. C.
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Propagation of Energetic Solar Particles

1985
In this Section we present some observational data on energetic particles accelerated on the Sun; these data are required for constructing models of particle propagation in interplanetary space. The data presented are only basic and not totally complete.
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Classification of solar energetic particles

Advances in Space Research, 2002
While it is now common to refer to a solar event as “impulsive” or “gradual,” the classification of the event can be difficult in practice and does not completely clarify the characteristics of solar energetic particles. In particular, a single event can produce multiple particle populations with distinct physical properties.
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Solar Energetic Particle Charge States: An Overview

Space Science Reviews, 2006
The ionic charge distributions of solar energetic particles (SEP) as observed in interplanetary space provide fundamental information about the origin of these particles, and the acceleration and propagation processes at the Sun and in interplanetary space.
Klecker, B., Möbius, E., Popecki, M.
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