Measurement of accelerated particles at the Sun

Details Measurement of accelerated particles at the Sun Measurement of accelerated particles at the Sun

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..528..181s&link_type=abstract

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

Other

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

Scientific paper

Solar γ-ray lines and continua provide information on flare-accelerated particles that interact at the Sun. We primarily discuss observations of flare spectra made by the OSSE experiment on CGRO and the gamma-ray spectrometer on SMM. Continuum γ-ray spectra reflect the MeV electron population. These spectra show various shapes above 0.1 MeV: single power laws, broken power-laws (both hardening and softening >0.1 to 0.3 MeV), and spectra that harden >=1 MeV. The spectra and directionality of accelerated protons and α-particles are revealed in the narrow lines from excited ambient nuclei and α-4He fusion. These measurements imply power-law spectral indices between ~-3 and -5 for energies >5 MeV/nucleon, evidence for both broad angular distributions and directionality in the interactions, and high accelerated α/p ratios (~0.5) in many flares. The presence of accelerated 3He is revealed in weak line features suggesting 3He/4He ratios of ~0.1 or greater. Strongly Doppler-broadened lines reveal the composition and directionality of heavy accelerated ions. Fe appears to be enhanced by about the same ratio found in impulsive SEPs. We present some preliminary results on flares that individually were not detected at energies >=1 MeV; their summed spectra exhibit hardening >1 MeV that may be due to nuclear radiation. There appears to be equipartition of energy between accelerated electrons and ions in flares with strong line emission. .

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