drift scan

drift scan

A profile of a radio source made with a radio telescope by aiming the antenna at a point beside the source and allowing the rotation of the Earth to move the source through the antenna beam.
References in periodicals archive ?
To prepare for the drift scan of the Sun illustrated at right, we moved the antenna until the feed's shadow coincided with the dish center and then advanced the dish to anticipate the Sun's motion across the sky.
For example, such a technique was used for our drift scan of the emission nebula M17 in Sagittarius.