Cesium Beam Atomic Clock Data
DESCRIPTION:
This series represents the difference in time between a cesium beam
atomic clock and an official time scale known as UTC(USNO) maintained
by the US Naval Observatory, Washington DC. The UTC portion of the
USNO series refers to coordinate universal time which is
used as an international time standard. Negative values in the
resulting (difference) series represents a lag in time relative to the
UTC(USNO) standard. The differences in time were recorded at the same
time for consecutive days in the 1970s resulting in a sampling
interval of 1 day. The amplitude units are expressed in
microseconds.