Asgard antigravity field
From The Stargate Omnipedia
Powerful field of energy that suspends an individual in mid-air, trapping them and allowing for an extremely limited range of movement. The field is represented by a generator from above and a trio of glowing, green orbs which encompass and encircle the subject.
The Asgard technology is vulnerable to the Goa'uld zat'ni'katel, releasing a subject to the floor.
KEY EPISODE
Fragile Balance - The Asgard scientist Loki uses an antigravity field to hold his human test subjects after transporting them to his ship from Earth.