Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 15, issue 21
Articles | Volume 15, issue 21
https://doi.org/10.5194/amt-15-6387-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-15-6387-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 15, issue 21
Research article
 | 
08 Nov 2022
Research article |  | 08 Nov 2022

Long-distance propagation of 162 MHz shipping information links associated with sporadic E

Alex T. Chartier, Thomas R. Hanley, and Daniel J. Emmons

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Latest update: 20 Jan 2025
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Short summary
This is a study of anomalous long-distance (>1000 km) radio propagation that was identified in United States Coast Guard monitors of automatic identification system (AIS) shipping transmissions at 162 MHz. Our results indicate this long-distance propagation is caused by dense sporadic E layers in the daytime ionosphere, which were observed by nearby ionosondes at the same time. This finding is surprising because it indicates these sporadic E layers may be far more dense than previously thought.
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