The data from OGO-5 and OSO-7 X-ray experiments have been analyzed to study six chromospheres flares with filament disruption associated with slow thermal X-ray bursts. Filament activation accompanied by a slight X-ray enhancement precedes the first evidence of Ha flare by a few minutes. Rapid increase of the soft X-ray flux is accompanied by a sudden brightening of the filament when viewed on-band Ha. Thereafter the bright chromospheres strands reach their maximum brightness with maximum X-ray flux. Any plateau or slow decay phase in the X-ray flux is accompanied by a quieting in filament activity and even by filament re-appearance. The height of the disrupted prominence is proportional to the soft X-ray flux for the August 3, 1970 limb occulted event. Analysis of the X-ray bursts on 2220 UT June 23, 1972 gives a 'cool' maximum temperature of 12.5 x 10 K and a maximum emission measure 47 -3 of 40 x 10cm.
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