Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 12, issue 2
Articles | Volume 12, issue 2
https://doi.org/10.5194/amt-12-1295-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-12-1295-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 12, issue 2
Research article
 | 
28 Feb 2019
Research article |  | 28 Feb 2019

Halo ratio from ground-based all-sky imaging

Paolo Dandini, Zbigniew Ulanowski, David Campbell, and Richard Kaye

Viewed

Total article views: 3,934 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
2,576 1,249 109 3,934 146 170
  • HTML: 2,576
  • PDF: 1,249
  • XML: 109
  • Total: 3,934
  • BibTeX: 146
  • EndNote: 170
Views and downloads (calculated since 28 Feb 2018)
Cumulative views and downloads (calculated since 28 Feb 2018)

Viewed (geographical distribution)

Total article views: 3,934 (including HTML, PDF, and XML) Thereof 3,656 with geography defined and 278 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved (final revised paper)

Latest update: 09 Jun 2026
Download
Short summary
The halo ratio indicates the strength of the 22° cirrus halo and gives valuable information on cloud properties. We obtain it from all-sky images by applying a range of transformations and corrections and averaging brightness azimuthally over sun-centred images. The ratio is then taken at two angles from the sun, 20° and 23°, in variance from previous suggestions. While we find ratios > 1 to be linked to halos, they can also occur under scattered cumuli as artefacts due to cloud edges.
Read more
Share