G-jitter references forms of periodic[1] or quasisteady residual acceleration encountered in a spacecraft floating through the micro-gravity confines of space.
Such variations slightly change the orientation and magnitude of a body force in a low-gravity testing environment,[2] which can either marginally or gravely affect the result of precision-heavy dependent experiments conducted on board a space station.
[2] Constant forces that last over 10 minutes while varying periodically in a single frequency can provide a noticeable offset in acceleration readings and deviate a testing environment from "true" micro-gravity.
Coriolis accelerations and solar radiation pressure can be also observed, but are generally negligible in comparison to the effects of other quasi-steady forces.
[2] Due to the rise in the awareness of the implications of g-jitter, accelerometers with capabilities to attune to a hectic low-gravity environment have begun to be incorporated within space vehicles.