Millisecond pulsars - Nature's most stable clocks

Details Millisecond pulsars - Nature's most stable clocks Millisecond pulsars - Nature's most stable clocks

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ieeep..79.1054t&link_type=abstract

IEEE, Proceedings (ISSN 0018-9219), vol. 79, July 1991, p. 1054-1062.

Physics

42

Frequency Stability, Pulsars, Time Measurement, Clocks, Ephemeris Time, Signal To Noise Ratios, Stellar Rotation

Scientific paper

The author describes the role pulsars might play in time and frequency technology. Millisecond pulsars are rapidly rotating neutron stars: spherical flywheels some 20 km in diameter, 1.4 times as massive as the Sun, and spinning as fast as several thousand radians per second. Radio noise generated in a pulsar's magnetosphere by a highly beamed process is detectable over interstellar distances, as a periodic sequence of pulses similar to the ticks of an excellent clock. High-precision comparisons between pulsar time and terrestrial atomic time show that over intervals of several years, some millisecond pulsars have fractional stabilities comparable to those of the best atomic clocks. The author briefly reviews the physics of pulsars, discusses the techniques of pulsar timing measurements, and summarizes the results of careful studies of pulsar stabilities.

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