Rapid acceleration of energetic particles in the 1982 February 8 solar flare

Details Rapid acceleration of energetic particles in the 1982 February 8 solar flare Rapid acceleration of energetic particles in the 1982 February 8 solar flare

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300l..95k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 300, Jan. 15, 1986, p. L95-L98.

Astronomy and Astrophysics

Astrophysics

72

Energetic Particles, Particle Acceleration, Solar Flares, Bremsstrahlung, Gamma Ray Bursts, Relativistic Particles, Solar X-Rays

Scientific paper

Hard X-ray and gamma-ray measurements of the February 8, 1982 (1250 UT) solar flare made with spectrometers aboard the ISEE 3 and SMM spacecraft show that bursts of photons from 40 keV to 40 MeV are coincident within + or - 1 s. This indicates that the acceleration of particles to relativistic velocities can occur promptly (within 1 s). As far as the energetic particles interacting at the sun are concerned, the 'two-phase' process, which requires several minutes for particle acceleration to relativistic velocities, cannot account for the present gamma-ray observations. Even the 'two-step' acceleration process, which is assumed to occur in a small magnetic loop, is severely constrained by the present observations.

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