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it is entirely possible for the Sun to cut loose
with a GIGANTIC CME full of all sorts of high energy
protons and electrons and other things that go bump in the night,
and if such a CME were to blast directly at planet Earth,
as it hit the upper atmosphere, all of the high
energy electrons and protons would start colliding with
all the Ozone molecules in the Ozone layer and cause them
to break apart, and combine with other elements (which would not be Ozone), etc. etc.,
and this calamitous churning cauldron of
chemistry going on in the upper atmosphere would be one
hell'uv'a lot more than any Aurora Borealis. the upshot
being that the entire Ozone Layer on the sun-lit side
of the Earth would be destroyed in an instant, and
all of the Ozone left on the dark-side of the Earth
wouldn't be enough to take-up-the-slack. and from that
moment forward the Earth will begin a very slow imperceptible "burning"
from all of the high energy Ultraviolet light that would then be reaching the surface
(note: "burning" is nothing other than high energy breaking up molecules,
until there is nothing left but carbon :)

anyway, after a week, all vegetation would be dead, all
the small animals will start dying, humans could not go
outside without being severely heated up,
then, no more food, and all the larger animals
and Humankind are all dead in a matter of months...