Time variations of the calcium elemental abundance in flares from NOAA active regions 2562 and 2779.
Abstract
Analysis of flare spectra obtained with the Bent Crystal Spectrometer aboard the Solar Maximum Mission (SMM) satellite enables the determination of the fluxes in the resonance (w) line of Ca XIX and the near-by continuum. The line-to-continuum intensity ratio is a sensitive measure of the calcium elemental abundance (ACa) relative to hydrogen in the emitting plasma. The authors analyse the variations of ACa for flares which occurred in two active regions well observed by SMM. They conclude that it is not possible to correlate the abundance variations with the time of the flare occurrence as suggested in an earlier paper for flares produced from a single active region. Further, the authors find no convincing correlation of abundance variation with any other flare characteristics.
- Publication:
-
Journal de Physique
- Pub Date:
- March 1988
- Bibcode:
- 1988JPhys..49..189S
- Keywords:
-
- Abundance;
- Calcium;
- Metallicity;
- Noaa Satellites;
- Solar Flares;
- Solar Maximum Mission;
- Solar X-Rays;
- Solar Physics;
- Solar Active Regions:Solar Flares;
- Solar Flares:Calcium;
- Solar Flares:Solar Active Regions