Perpendicular Diffusion in the Transport of Solar Energetic Particles from Unconnected Sources: The Counter-streaming Particle Beams Revisited

Abstract

In some solar energetic particle (SEP) events, a counter-streaming particle beam with a deep depression of flux near 90 degrees pitch angle during the beginning phase is observed. Two different interpretations exist in the community to explain this interesting phenomenon. One explanation invokes the hypothesis of an outer reflecting boundary or a magnetic mirror beyond the observer. The other one considers the effect of the perpendicular diffusion on the transport process of SEPs in the interplanetary space. In this work, we revisit the problem of the counter-streaming particle beams observed in SEP events and discuss the possible mechanisms responsible for the formation of this phenomenon. We clarify some results in previous works.

Published in ApJ

References in corpus (5)

• The large longitudinal spread of solar energetic particles during the January 17, 2010 solar event
• On Aspects Pertaining to the Perpendicular Diffusion of Solar Energetic Particles
• Numerical Study of the Longitudinally Asymmetric Distribution of Solar Energetic Particles in the Heliosphere
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Cited by in corpus (8)

• Perpendicular Diffusion of Solar Energetic Particles: Model Results and Implications for Electrons
• A Primer on Focused Solar Energetic Particle Transport: Basic physics and recent modelling results
• Solar energetic particle propagation in wave turbulence and the possibility of wave generation
• On the East-West Longitudinally Asymmetric Distribution of Solar Proton Events
• Propagation of Solar Energetic Particles in Three-dimensional Interplanetary Magnetic Fields: Radial Dependence of Peak Intensities
• The Solar Cycle Variations of the Anisotropy of Taylor Scale and Correlation Scale in the Solar Wind Turbulence
• Propagation of Solar Energetic Particles in the Outer Heliosphere: Interplay between Scattering and Adiabatic Focusing
• New Insight into the Formation Mechanism of the Energetic Particle Reservoirs in the Heliosphere