Positron annihilation radiation and > 10 MeV gamma-rays from the 1997 November 6 flare

Details Positron annihilation radiation and > 10 MeV gamma-rays from the 1997 November 6 flare Positron annihilation radiation and > 10 MeV gamma-rays from the 1997 November 6 flare

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3025y&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

Yohkoh observed the positron annihilation ra diation at 511 keV and high-energy γ rays at 10-100 MeV from a X9.4/3B flare at 11:52 UT on November 6, 1997. A lower limit for line fluence is 64 ± 13 photons/cm2 and the line width (FWHM) was <16 keV. The Yohkoh data places restrictions on the temperature of <2.1 MK and the density of >1014 cm-3 at the positron annihilation site. The spectrum above 10 MeV suggests a mixture of primary electron bremsstrahlung and broad-band γ rays resulting from the π0 decay. It implies that protons were efficiently accelerated to energies above a few hundreds of MeV and streamed down to the chromosphere. We discuss high-energy particle production based on the Yohkoh and solar energetic particle (SEP) observations.

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