What question did this study set out to answer?

Evaluate frequency variations in shortwave propagation to assess suitability for standard frequency comparisons and communication service reliability.

December 1, 1958Proceedings of the IRE

Frequency Variations in Short-Wave Propagation

View Full Paper

Ask AI

Bookmark

Authors

TOToru OgawaTohoku University

Discussion

Member takes

Implication

Observational study reveals diurnal frequency variations in ionospheric shortwave signals, indicating midday E-layer reflections provide sufficient stability without disrupting communications.

Key Points

Evaluate frequency variations in shortwave propagation to assess suitability for standard frequency comparisons and communication service reliability.
Monitored standard frequency shortwave transmissions at 5 mc and 10 mc from station JJY over a 360-km east-west path for approximately six months starting in August 1957.
Tracked diurnal and seasonal propagation differences between daytime E-layer and nighttime F2-layer reflections, comparing stability against VLF standard signals.
Daytime E-layer reflection at 5 mc yielded a frequency comparison accuracy of 5×10⁻⁹, which was inferior by a factor of approximately ten compared to VLF standards.
Nighttime 5-mc signals and continuous 10-mc signals exhibited frequency variations up to 3×10⁻⁷, which remained within acceptable limits for communication systems.
Distinct transitional patterns were documented during morning F2-to-E layer transitions compared to evening E-to-F2 layer transitions.

Cite This Study

Toru Ogawa (1958) studied this question.

synapsesocial.com/papers/6a96c05da45595e5080e384d https://doi.org/10.1109/jrproc.1958.286813

View Full Paper

Ask AI

Bookmark

Implication

Observational study reveals diurnal frequency variations in ionospheric shortwave signals, indicating midday E-layer reflections provide sufficient stability without disrupting communications.

Frequency Variations in Short-Wave Propagation

Discussion

Member takes

Implication

Key Points

Cite This Study

Frequency Variations in Short-Wave Propagation

Discussion

Member takes

Implication

Key Points

Cite This Study

Also Consider

Also Consider