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Is it to help with airflow so the aircraft can do carrier approaches with less risk of wing drop? If so, the program originally told us wind drop was reduced with software fixes.
As an aside: I have no idea what this is in front of the right-side vertical tail.
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This from the F-35 fan-club back in August. It doesn't state which variant. It only mentions the F-35 in general.
On the other hand, wing drop is no longer a performance issue for the F-35, contrary to claims in some quarters, our authoritative source at the Pentagon tells us. The issue is, as almost always, much more complex than that simple statement indicates, but it’s been 18 months since the issue surfaced and software fixes leave the Joint Strike Fighter in fine shape, this source says.
What happened? Basically, new algorithmns were written, tested in the trans-sonic envelope where most of the problems occurred and the services found a solution that didn’t completely eliminate all drop at all times but left the plane performing to the highest standards achievable. In short, they found a problem and fixed it to a standard all three services could live with.
Look at this photo from 2009 in this Aviation Week article. Yet another appliance, a pop-out spoiler past the F-35C wing-fold in order to reduce...wing-drop.
Finally, this also from 2009 re: the F-35C.
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