Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 19, issue 18
Articles | Volume 19, issue 18
https://doi.org/10.5194/amt-19-5905-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-19-5905-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 18
Research article
 | 
17 Sep 2026
Research article |  | 17 Sep 2026

On the origin of the twilight color index maximum and its application to cloud-height retrieval

Daniel Toledo

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Short summary
A single-scattering formulation of the color index is presented to investigate the physical mechanisms governing the CI maximum observed during twilight in the presence of high-altitude clouds. Within this framework, the maximum is shown to occur at the solar zenith angle (SZA) for which the relative SZA-variations of the zenith intensity become equal at the two selected wavelengths. The formulation is validated against Monte Carlo radiative transfer simulations, showing good agreement.
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