First you will see a small purple ball flying towards you. Then when it hits you will be unable to move, and you will see a purple haze around your ship. All your abilities will be disabled except for sci team. Click sci team and it will remove it after its hit. If you have multiple sci debuffs on you; theirs a chance that it will remove one of the other debuffs and then your just plain screwed unless one of your team members sci teams you.
One thing you can do is if you see the purple orb heading towards you activate reverse shield polarity just before it hits. If your a escort pilot you can use attack pattern omega to get out of it.