TIME VARIATIONS OF THE CALCIUM ELEMENTAL ABUNDANCE IN FLARES FROM NOAA ACTIVE REGIONS 2562 AND 2779 J. SYLWESTER, M.-C. ZOLCINSKI-COUET, R.D. BENTLEY and J.R. LEMEN J. Phys. Colloques, 49 C1 (1988) C1-189-C1-193 DOI: 10.1051/jphyscol:1988136