Speaker
Barbara Sylwester
(Space Research Center, Polish Academy of Sciences)
Description
Using revised Bent Crystal Spectrometer instrument characteristics, we determined absolute abundances of calcium A(Ca) for 207 flares in their decay phases. The accuracy of abundance determination was the best ever achieved for hot (T > 5 MK) flaring plasma sources, amounting to only 1 - 3 percent for some flares. While the calcium abundance is constant during the decay phase for most cases, for several flares the abundance is observed to change with time. We present patterns of A(Ca) variability for these flares, some of them showing an abundance rise, others a decrease with time during the decay. We discuss the results and present possible physical scenarios which may account for the observed abundance changes.
Primary authors
Barbara Sylwester
(Space Research Center, Polish Academy of Sciences)
Janusz Sylwester
(Space Research Centre, Polish Academy of Sciences)
Dr
Kenneth Phillips
(Natural History Museum)
Anna Kępa
