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Explosive energy release is a common phenomenon occurring in magnetizedplasma systems ranging from laboratories, Earth's magnetosphere, the solarcorona and astrophysical environments. Its physical explanation is usuallyattributed to magnetic reconnection in a thin current sheet. Here we report theimportant role of magnetic flux rope structure, a volumetric current channel,in producing explosive events. The flux rope is observed as a hot channel priorto and during a solar eruption from the Atmospheric Imaging Assembly (AIA)telescope on board the Solar Dynamic Observatory (SDO). It initially appears asa twisted and writhed sigmoidal structure with a temperature as high as 10 MKand then transforms toward a semi-circular shape during a slow rise phase,which is followed by fast acceleration and onset of a flare. The observationssuggest that the instability of the magnetic flux rope trigger the eruption,thus making a major addition to the traditional magnetic-reconnection paradigm.

Observation of An Evolving Magnetic Flux Rope Prior To and During A Solar Eruption