Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mmsai..52..233m&link_type=abstract
Società Astronomica Italiana, Memorie, vol. 52, June 1981, p. 233-248.
Astronomy and Astrophysics
Astronomy
Atomic Clocks, Gravitational Effects, Lunar Gravitational Effects, Solar Gravitation, Time Measurement, Diurnal Variations, Loran C, Propagation Velocity, Radio Transmission, Relativistic Effects, Troposphere
Scientific paper
An investigation is presented of the diurnal variations in atomic time scales due to the gravitational effects of the sun and moon. The investigation involved phase comparisons between the local atomic time scale at Cagliari Observatory and signals received from the Sellia Marina Loran-C station over an extremely stable transmission path. The observed diurnal variations in phase difference are observed to correspond well in phase to those expected due to relativistic effects caused by the solar gravitational field, although the amplitude of the observed effect far exceeds that predicted by gravitational effects alone. It is suggested that this discrepancy may be due to factors influencing LF propagation velocities in the lower troposphere, and it is proposed that detailed investigations be carried out on all the factors which may have significant effects on propagation, particularly atmospheric gravity waves and tidal waves.
Mereddu L.
Proverbio E.
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