09 Aug 2022
09 Aug 2022
Status: this preprint is currently under review for the journal AMT.

Long Distance Propagation of 162-MHz Shipping Information Links Associated with Sporadic-E

Alex T. Chartier1, Thomas R. Hanley1, and Daniel J. Emmons2 Alex T. Chartier et al.
  • 1Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, United States of America
  • 2Air Force Institute of Technology, Wright-Patterson AFB, OH 45433, United States of America

Abstract. Anomalous long distance reports of Automatic Identification System (AIS) shipping transmissions were received by a United States Coast Guard terrestrial monitoring network in the eastern United States and Puerto Rico. 6677 signals were identified from ships located over 1000-km from the ground stations between 13 and 14 July 2021, with almost no long-distance links received at night or at any time on 15 July. The cause appears to be sporadic-E layers identified by Digisonde and satellite radio occultation data. The density of these layers cannot be accurately determined, but might exceed 27 MHz, or 9x1012 el. m3. AIS transmissions potentially provide an excellent means of identifying dense sporadic-E layers globally.

Alex T. Chartier et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2022-214', Anonymous Referee #1, 09 Aug 2022
    • AC1: 'Reply on RC1', Alex Chartier, 09 Aug 2022
      • RC2: 'Reply on AC1', Anonymous Referee #1, 09 Aug 2022
  • RC3: 'Comment on amt-2022-214', Anonymous Referee #2, 16 Aug 2022

Alex T. Chartier et al.

Alex T. Chartier et al.


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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.