On the Positronium Continuum and 0.511 MeV Line in Solar Flares

Details On the Positronium Continuum and 0.511 MeV Line in Solar Flares On the Positronium Continuum and 0.511 MeV Line in Solar Flares

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004chjaa...4..357g&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 4, p. 357-364

Astronomy and Astrophysics

Astrophysics

1

Sun: Flares, Sun: X-Rays, Gamma-Rays

Scientific paper

We have studied the influence of the density of the annihilation region on the positronium continuum. A relation between the ratio 3γ/2γ and the density is explicitly given, with which one can derive directly from the observed 3γ/2γ the density where the annihilation occurs. A unique solution may be found from the observed width of the 0.511 MeV line. We applied the method to three flares observed by GRS/SMM. It is shown that due to the measuring uncertainties in the 0.511 MeV line width, we cannot distinguish a chromospheric source from a coronal source, though both accurately localized. To improve the measuring accuracy of the 0.511 MeV line and the ratio 3γ/2γ will be an important step for a better understanding of the annihilation process in solar flares.

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