I have a question regarding weapons with the Ion weapon quality. One of the modifications for this attachment is that the defender can choose the ship component affected by the Ion weapon quality rather than the attacker. However, I can't find any reference anywhere else stating that the attacker can do this - including in the Ion quality. There are vague references to it affecting systems - but no specifics, such as the attacker choosing to do such a thing.
Would this cost advantages to activate? How long are the systems down?
I am curious as to how others handle this or if I am missing something within the rules.