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Gamma-Rays From Solar Flares

Gamma-Rays From Solar Flares. Content. Electron bremsstrahlung continuum Nuclear de-excitation lines Neutron capture line Positron annihilation Pion decay radiation. Spectrum. Gamma-Rays. bremsstrahlung. bremsstrahlung. Thin target and thick target bremsstrahlung. Thick:. Thin:.

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Gamma-Rays From Solar Flares

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  1. Gamma-Rays From Solar Flares

  2. Content • Electron bremsstrahlungcontinuum • Nuclear de-excitation lines • Neutron capture line • Positron annihilation • Pion decay radiation

  3. Spectrum

  4. Gamma-Rays

  5. bremsstrahlung

  6. bremsstrahlung • Thin target and thick target bremsstrahlung Thick: Thin:

  7. Acceleration Mechanisms

  8. Electron bremsstrahlung continuum

  9. Electron bremsstrahlung continuum • e-p bremsstrahlung and e-e bremstrahlung for e-p for e-e Kontar et al 2007

  10. Long term trapping source

  11. Lines

  12. Nuclear De-excitation Lines Narrow lines :bombardment of ambient nuclei by accelerated protons and –particles; Broad lines: Inverse reactions in which accelerated C and heavier nuclei collide with ambient H and He.

  13. Ion-Electron Ratios • significant correlation between the fluences of hard X-ray producing electrons (>50keV) and gamma-ray lines (4~8MeV). • > A common acceleration mechanism for ~10keV electrons and ~10MeV. • Abundances of Accelerated Ions.

  14. Neutron Capture Line • A prominent, very narrow gamma-ray line appears at 2.223 MeV. • Used to calibrate instrument or determine bulk motion.

  15. Neutron Capture Line and 4~7 MeV flux From Hua 1987

  16. Positron Annihilation Line Lingenfelter & Ramaty1967

  17. Positron Annihilation Line

  18. 3 gamma/2 gamma Share 2004

  19. Pion Decay Radiation

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