  We characterize the Magellanic Corona, the warm gaseous halo around the Large
Magellanic Cloud (LMC). The Corona is a key ingredient in the formation of the
Magellanic Stream (Lucchini et al. 2020, 2021) and has recently been observed
in high-ion absorption around the LMC. In this work we present a suite of
high-resolution hydrodynamical simulations to constrain its total mass and
temperature prior to the infall of the Magellanic Clouds to our Galaxy. We find
that the LMC is able to host a stable Corona before and during its approach to
the MW through to the present day. With a Magellanic Corona of $>2\times10^9$
M$_\odot$ at $3\times10^5$ K, our simulations can reproduce the observed total
mass of the neutral and ionized components of the Trailing Stream, size of the
LMC disk, ionization fractions along the Stream, morphology of the neutral gas,
and on-sky extent of the ionized gas. The Corona plays an integral role in the
survival, morphology, and composition of the Magellanic Clouds and the Trailing
Stream.
