Goa'uld Technology in Stargate - Cloaking and Shielding

Cloaking and Shielding

• Cloaking device – The existence of Goa'uld cloaking technology is first revealed in "Fair Game", when Nirrti uses a personal cloaking device based on Reetou phase-shifting. Yu is outraged that she has not shared this technology with the System Lords. Personal cloaking devices have also been used by Hathor, and an ash'rak assassin. Cloaking devices first appear on a Goa'uld cargo ship in "Deadman Switch", and in later episodes become commonplace for Tel'taks and Al'kesh. In "The Serpent's Venom", Apophis cloaks an entire fleet of Ha'taks, a feat that Selmak says has never before been accomplished.

• Force Shield – A energy barrier, also called a force-field or simply a shield. Goa'uld force shields work on a frequency oscillation principle, so a fast moving object can bypass it at the right moment. Goa'uld motherships are protected by force shields, as are some ground-based facilities. Force shields are also installed inside ships to restrict access to certain areas, and to contain hull breaches. Some powerful Goa'uld are equipped with personal force shields activated with a button on their hand device. These shields react proportionally to the amount of kinetic energy of incoming matter, blocking fast-moving objects like bullets but not slower objects like an object thrown by hand. This is so the shield does not stop air from getting in. The Tok'ra have made force shield technology available to the SGC. The Lucian Alliance has also obtained shield technology, and it appears to block any solid object, regardless of velocity.

• Gate Shield – A force field that blocks a Stargate from unauthorized access, functioning similarly to Earth's Iris, though it does not impede the energy-absorbing armor of a Kull Warrior. It can be deactivated remotely by a specific code. Planets with shielded Stargates include Tartarus and Erebus.

• Sun shield – A pair of devices on P3X-513 designed to generate a massive force-field that protects the area below from ultraviolet radiation. It turns the sky orange as a side-effect. The device is reactivated by SG-1, in the process disproving former SGC officer Jonas Hanson's claim of divinity that he had used to seize power on the planet.