Terrestrial jamming

Definition
Terrestrial jamming

"affects the operating ability of receivers located in specific geographic regions, and is a well-known technique that has been used over many years by, for example, authoritarian governments attempting to prevent people from accessing unauthorized radio or television broadcasts. During periods of unrest and political control, radio and television reception has been blocked in several countries through electromagnetic terrestrial jamming for long periods of time, so that the governments maintained significant domestic controls over available information and mass communication. Terrestrial jamming of signals has also been used in more recent times to block access to mobile phone networks and the internet. This is sometimes called a wireless 'denial-of-service' attack and can take many forms."