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Pulsar Astrometry and Improved Terrestrial Clocks

Published online by Cambridge University Press:  12 April 2016

Demetrios N. Matsakis ,
Frederick J. Josties  and
Roger S. Foster
Demetrios N. Matsakis
Affiliation:
U.S. Naval Observatory, WashingtonDC 20392
Frederick J. Josties
Affiliation:
U.S. Naval Observatory, WashingtonDC 20392
Roger S. Foster
Affiliation:
Code 7213, Naval Research Laboratory, WashingtonDC 20375

Abstract

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Recent improvements in cesium and hydrogen terrestrial frequency standards have brought the frequency precision of International Atomic Time (TAI) to a value of 2.5E-15 s/s over an averaging time of a month. In this paper we illustrate the improvement graphically, and discuss the state of the art for frame ties between the radio, dynamical, and optical frames. In a larger paper, available via the World Wide Web, we illustrate the measured accuracy curves of the frequency standards, show their effect on the ensemble time scales, explain the reasons for the confusing array of available time scales, and discuss the inverse problem of using pulsar data to correct the terrestrial time scale.

Type
Part 2 Precision Measurements
Information
International Astronomical Union Colloquium , Volume 160: Pulsars: Problems and Progress , 1996 , pp. 113 - 114
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

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