Physics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43.1267w&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 43, Dec. 1981, p. 1267-1269. Research supported by the Australian Research
Physics
2
Ionospheric Disturbances, Radar Echoes, Sunrise, Sunset, Terminator Lines, Velocity Measurement, Australia, Calibrating, F Region, High Frequencies, Propagation Velocity
Scientific paper
A suggestion is made concerning the use of the wave disturbances induced by the sunrise and sunset terminators for the calibration of HF radio reflection techniques measuring the velocity of ionospheric movements. Observations of the E-W and the N-S angles of arrival and the rate of change of phase range of radar echoes during sunrise are presented which demonstrate an overall negative correlation of E-W angle of arrival with the rate of change of phase range, and indicate a fluctuation velocity of 415 + or - 30 m/sec. Further observations of F-region reflections at sunrise and sunset at Brisbane, Australia indicate disturbances with a mean velocity of 400 m/sec, in agreement with the terminator velocity at this latitude. The agreement between measured and known terminator velocities thus demonstrates the reliability of the radar reflection method.
Brownlie G. D.
From W. R.
Whitehead Dion J.
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