Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp21a..09m&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SP21A-09
Physics
7507 Chromosphere, 7514 Energetic Particles (2114), 7519 Flares, 7554 X Rays, Gamma Rays, And Neutrinos
Scientific paper
We have developed an algorithm that calculates the 511-keV annihilation line spectrum and relative strength of the 3-gamma continuum for a wide range of physical environments from the flaring solar atmosphere to the interstellar medium. We present evaluated cross sections for each of the processes relevant to the positrons and their annihilation based on the most recent measurements and calculation. The calculation begins with a Monte Carlo code that follows positrons as they slow down to thermal energies or form positronium in flight. We then calculate the thermally-averaged annihilation and positronium production rates, and the positronium quenching rates. We apply the results to four specific environments (fully ionized, neutral, partially ionized and a non-LTE model of the quiet solar atmosphere), and calculate the relative strengths of each process and the combined total annihilation line spectrum. The results are compared with data obtained recently from the high spectral-resolution detectors of RHESSI. We find that positron annihilation in solar flares can occur in a wide variety of environments that can be quite different from currently-accepted solar atmospheres.
Kozlovsky Benz
Murphy Ronald J.
Share Gerald H.
Skibo Jeffery G.
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