Sun shield
From The Stargate Omnipedia
Powerful energy field which protects the cave-dwelling population of Jamala's planet from harmful interstellar radiation and ultraviolet rays, capable of making the sky an orange hue. The sun shield is initiated by twin generators which lock on to each others' coordinates, draping an enormous orange shield "bubble" down over the valley.
The dwellers declare that "when the sky is orange, it's good."
KEY EPISODE
The First Commandment - Jonas Hansen of Earth appoints himself leader of the cave-dwelling tribe of P3X-513, declaring he possesses the power of the sun shield and the ability to make the sky orange.