In fact, it is - at one and the same. Solar flare and corona ejections (plasma burst) - different things, but usually takes place at the same time, in the same active region.
Solar flare - is the speed of light traveling in all directions X and gamma rays, and that's the plasma burst - Sun emitted a huge cloud of plasma, the particle orbits outside the Earth so fast and reaches only 2-3 days. Meanwhile, flash rays reach Earth in just 8 minutes.
And Solar flares and bursts of plasma monitor and record the light to orbiting around our probes. NASA gathered the most obvious evidence of solar flares and bursts and snippets provided in this concise but impressive video.
