It could be one of two things that come to mind right now.

The first thing is a set of bus wires to feed the internal
heating grid for de-icing the canopy. The other wires that
do the actual heating would be too small to see.

The second thing that I can think of is the possible method
that is used to get the canopy out of the way for an ejection.
I believe, and could be wrong, that some of the canopies do not
actually slide to the back to allow ejection but the canopy itself
is shattered by an internal linear explosive that allows the crew
to leave the plane without contacting the canopy.


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