Slow X-ray bursts and chromospheric flares with filament disruption

Physics

Scientific paper

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Chromosphere, Filaments, Solar Flares, Solar X-Rays, Magnetic Fields, Ogo-5, Oso-7, Plasmas (Physics), Solar Physics, Thermal Emission

Scientific paper

The data from OGO-5 and OSO-7 X-ray experiments have been analyzed to study six chromospheric 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 H alpha 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 H alpha. Thereafter the bright chromospheric 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.

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