The Interaction of Solar Flare Accelerated Electron Beams with the Turbulent Solar Wind

Details The Interaction of Solar Flare Accelerated Electron Beams with the Turbulent Solar Wind The Interaction of Solar Flare Accelerated Electron Beams with the Turbulent Solar Wind

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21632107r&link_type=abstract

American Astronomical Society, AAS Meeting #216, #321.07; Bulletin of the American Astronomical Society, Vol. 41, p.912

Astronomy and Astrophysics

Astronomy

Scientific paper

Solar flare accelerated electron beams propagating away from the Sun can interact with the turbulent interplanetary media, producing plasma waves and type III radio emission. These electron beams are detected near the Earth with a double power-law energy spectra. We simulate electron beam propagation from the Sun to the Earth in the weak turbulent regime taking into account the self-consistent generation of plasma waves and subsequent wave interaction with density fluctuations from low frequency MHD turbulence. The rate which plasma waves are induced by an unstable electron beam is reduced by background density fluctuations, most acutely when fluctuations have large amplitudes or small wavelengths. This suppression of plasma waves alters the wave distribution which changes the electron beam transport. Assuming a 5/3 Kolmogorov-type power spectra of density fluctuations often observed near the Earth, we investigate the corresponding energy spectra of the electron beam after it has propagated 1AU. We find a direct correlation between the spectra of the double power-law below the break energy and the turbulent intensity of the background plasma. By varying the radial dependency of density fluctuations, injected electron spectra with spectral index 3-4 produce double power-laws near the Earth with spectra below the break energy within the range 1.6-2.4, agreeing with observational values.

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