A survey of 40-300 keV electron events with beam-like anisotropies

Details A survey of 40-300 keV electron events with beam-like anisotropies A survey of 40-300 keV electron events with beam-like anisotropies

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..528...95h&link_type=abstract

ACCELERATION AND TRANSPORT OF ENERGETIC PARTICLES OBSERVED IN THE HELIOSPHERE: ACE 2000 Symposium. AIP Conference Proceedings, V

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5

Particle Emission, Solar Wind, Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays

Scientific paper

Beam-like solar energetic electron events provide new insight into acceleration and transport of ~40-300 keV particles from the solar corona to 1 AU. The EPAM instrument on the ACE spacecraft provides a unique set of measurements with its magnetically deflected ``pure'' electron channels, enabling us to unambiguously discriminate ions from electrons. With this identification, we can then also utilize our higher sensitivity ``foil'' electron spectrometers (which respond to ions with a low efficiency). This combination of ``pure'' and ``foil'' electron measurements then uniquely allows us to construct pitch-angle distributions over nearly a full 180-degree range. The electron observations used in this study have time resolution ~1 minute. We report on a survey of energetic electron events with large anisotropies in which the statistical significance of the intensity in the peak direction is much greater (>~10σ) than the isotropic component. Beam-like pitch-angle distributions imply nearly scatter-free propagation. Because these electrons are almost relativistic (0.4<~v/c<~0.8) knowledge of the path length back to the Sun should in principle permit one to compute the release time in the corona to within a few minutes. Although impulsive injection produces the most obvious beam events, we often find periods with beams lasting many hours with nearly constant intensity, implying constant outflow from the corona with no apparent correlation to the 1-8 angstrom X-ray emission. .

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