On the positronium continuum and 0.511 MeV line in solar flaresстатья
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Дата последнего поиска статьи во внешних источниках: 4 октября 2013 г.
Аннотация:Abstract We have studied the influence of the density of the annihilation region
on the positronium continuum. A relation between the ratio 3
/2
and the density
is explicitly given, with which one can derive directly from the observed 3
/2
the density where the annihilation occurs. A unique solution may be found from
the observed width of the 0.511MeV line. We applied the method to three flares
observed by GRS/SMM. It is shown that due to the measuring uncertainties in the
0.511MeV line width, we cannot distinguish a chromospheric source from a coronal
source, though both accurately localized. To improve the measuring accuracy of
the 0.511MeV line and the ratio 3
/2
will be an important step for a better
understanding of the annihilation process in solar flares.