What We Know and Do Not Know about High Energy Neutral Emissions from Solar Flares (A Challenge for Future Missions)

Details What We Know and Do Not Know about High Energy Neutral Emissions from Solar Flares (A Challenge for Future Missions) What We Know and Do Not Know about High Energy Neutral Emissions from Solar Flares (A Challenge for Future Missions)

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3171c&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

1

Scientific paper

Satellite missions since 1980 have observed at least 40 flares for which there is direct observational evidence for photon and neutron emissions with energies above 10 MeV, the latter sometimes also detected at ground level. In this presentation we will fo cus on a class of events for which these "High Energy Neutral Emissions" show successive phases: an impulsive phase (˜ one minute ) with strong nuclear lines and often meson production (signature of > 300 MeV/nucleon ions) followed by an extended phase (a few minutes up to several hours) with emission > 10 MeV dominated by meson and neutron production. In addition, relativistic electron bremsstrahlung is observed during both phases. The time evolution of the spectral characteristics of the High Energy Neutral Emissions suggests that both phases corresp ond to different acceleration/transport processes. However the lack of imaging data at photon energies in the 10-100 MeV range, and of spectral data above 100 MeV, prevents us from determining the location of the acceleration/interaction region(s), and the upper-energy cutoff of the accelerated particles, and therefore the mechanisms involved. We will propose a realistic experimental method to eliminate this deficiency.

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