If someday Aliens decide to invade and annex earth from the strategical point of view it would be effective to cripple our space scanning and orbital communication instruments. Why?
First off Aliens can see that the whole of earth at night is one brightly lit up planet no matter wherever you are. They also have noted that the Americas and Asia lie on the opposite side of the globe and both are pretty brightly lit. So they decide that 'Whoa! these people live across the entire surface area of their planet. These guys must be able to communicate somehow across the miles of water that lies between them.' So the alien (lets call him the General) thinks and suddenly hits a brainwave that the shiny, metallic, solar powered things in orbit around the planet are communication devices. And the General, being the general, orders his elite sabotage team to destroy any object in space which is receiving radio waves, microwaves or other EMR stuff from earth. Of course that includes all of our poor satellites which transmit some of our most important data like commercials, HBO, News, Torrents, Spy information etc.
Right now just after the general gave orders for all orbital scum to be blew up and cleanse the orbit for mobilizing his army. Situation on earth is bad. No TV, no Internet. Poor humans are cutoff flight crash those few which make it safely don't know what's happening. The people who are on ground are unaware why are they getting no internet despite the fact that they paid their last bill just yesterday. In this case:
What kind of protocol (If it exists) is supposed to be observed given any such untoward event happens
If there is no such protocol how do I design a protocol or some kind of parallel to a state of emergency that it seems realistic