  Active regions (AR) appearing on the surface of the Sun are classified into
$\alpha$, $\beta$, $\gamma$, and $\delta$ by the rules of the Mount Wilson
Observatory, California on the basis of their topological complexity. Amongst
these, the $\delta$-sunspots are known to be super-active and produce the most
X-ray flares. Here, we present results from a simulation of the Sun by
mimicking the upper layers and the corona, but starting at a more primitive
stage than any earlier treatment. We find that this initial state consisting of
only a thin sub-photospheric magnetic sheet breaks into multiple flux-tubes
which evolve into a colliding-merging system of spots of opposite polarity upon
surface emergence, similar to those often seen on the Sun. The simulation goes
on to produce many exotic $\delta$-sunspot associated phenomena: repeated
flaring in the range of typical solar flare energy release and ejective helical
flux ropes with embedded cool-dense plasma filaments resembling solar coronal
mass ejections.

Solar and Stellar Astrophysics