We report on high-resolution imaging and spectral observations of eruptions of a spiral structure in the transition region , which were taken with the Interface Region Imaging Spectrometer ( IRIS ) , the Atmospheric Imaging Assembly ( AIA ) and the Helioseismic and Magnetic Imager ( HMI ) .
The eruption coincided with the appearance of two series of jets , with velocities comparable to the Alfvén speeds in their footpoints .
Several pieces of evidence of magnetic braiding in the eruption are revealed , including localized bright knots , multiple well-separated jet threads , transition region explosive events and the fact that all these three are falling into the same locations within the eruptive structures .
Through analysis of the extrapolated three-dimensional magnetic field in the region , we found that the eruptive spiral structure corresponded well to locations of twisted magnetic flux tubes with varying curl values along their lengths .
The eruption occurred where strong parallel currents , high squashing factors , and large twist numbers were obtained .
The electron number density of the eruptive structure is found to be \sim 3 \times 10 ^ { 12 } cm ^ { -3 } , indicating that significant amount of mass could be pumped into the corona by the jets .
Following the eruption , the extrapolations revealed a set of seemingly relaxed loops , which were visible in the AIA 94 Å channel indicating temperatures of around 6.3 MK .
With these observations , we suggest that magnetic braiding could be part of the mechanisms explaining the formation of solar eruption and the mass and energy supplement to the corona .