Abundances from solar flare line spectroscopy

Updating and improvement of computer codes used in the abundance analyses of solar-flare gamma-ray data are described. These modifications are itemized in detail. The abundance analysis technique was then applied to data obtained by the Gamma-Ray Spectrometer of the Solar Maximum Mission spacecraft for the 27 April 1981 solar flare to set constraints on the interacting-particle angular distribution. The results are presented. Research in several other areas was also performed and they are discussed.