Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 13
Articles | Volume 26, issue 13
https://doi.org/10.5194/acp-26-9571-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-9571-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 13
Research article
 | 
08 Jul 2026
Research article |  | 08 Jul 2026

Automated detection of low-altitude isolated mesospheric radar echoes using YOLOv8: evidence for an ionospheric “C layer” phenomenon below 60 km altitude?

Yadu Krishnan Krishnakumar, Toralf Renkwitz, and Andreas Ahrens

Viewed

Total article views: 1,271 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
842 329 100 1,271 56 106
  • HTML: 842
  • PDF: 329
  • XML: 100
  • Total: 1,271
  • BibTeX: 56
  • EndNote: 106
Views and downloads (calculated since 06 Mar 2026)
Cumulative views and downloads (calculated since 06 Mar 2026)

Viewed (geographical distribution)

Total article views: 1,271 (including HTML, PDF, and XML) Thereof 1,265 with geography defined and 6 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 08 Jul 2026
Download
Short summary
We report on the observations of radar echoes at the lower HF range from the lower part of the ionosphere, below 60 km altitude. The observed echoes are actually seen below and isolated to the generally accepted lowermost ionospheric D region. For the detection of these echoes we employed machine learning techniques for the inspection of 4 years of radar raw data. We derived statistical parameters of their occurrence and hypothesised a connection for galactic cosmic rays as an ionisation source.
Read more
Share
Altmetrics
Final-revised paper
Preprint