Formation of a Broken Power-Law Electron Spectrum in Impulsive Solar Flare Energetic Electron Events

Physics – Plasma Physics

Scientific paper

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[7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7519] Solar Physics, Astrophysics, And Astronomy / Flares, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Impulsive solar energetic particle events have an attractive diagnostic potential for poorly understood particle acceleration processes in solar flares. Some solar energetic particle events are believed to propagate almost scatter-free from the Sun, and hence their spectrum should be that of accelerated particles. We simulate propagation of energetic electrons from the Sun to the Earth including wave-particle interactions in the inhomogeneous heliospheric plasma. We show the that an injected single power-law spectrum will be detected at 1AU as a broken power-law due to wave-particle interaction in the inhomogeneous plasma. It is demonstrated that the large scale density inhomogeneity as well as small scale density fluctuations affecting Langmuir waves are indirectly responsible for flattening the electron spectra below the break energy.

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