Coronal explosions

Physics

Scientific paper

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Plasma Waves, Solar Corona, Solar Flares, Solar Physics, Wave Propagation, H Alpha Line, Solar Atmosphere, Solar Spectrometers, Solar X-Rays, Thermal Plasmas

Scientific paper

A search was conducted for a new phenomenon, called 'coronal explosions', in three solar flares, and these were indeed found in all three. A coronal explosion is the propagation of a density wave through the flaring area. The wave emerges from one or two small areas (the 'sources') which are close to, but not identical with, the sources of hard X-ray burst emission. In all three cases, the explosion starts at the end of the impulsive phase, during or after the last hard (greater than about 20 keV) X-ray burst. The velocities of propagation range between 1800 and a few tens of km/s, and tend to decrease with time. It is suggested that the bursts are magnetohydrodynamical (shock) waves moving downward into denser regions.

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