Clouds occasionally form halo rings around the Sun due to the refraction of light through ice crystals

the verdict

SUPPORTED

the evidence backs this

Recorded sources

4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Scientific literature robustly supports the fact that ice crystals within high clouds refract sunlight to form optical halo rings around the Sun.

The analysis

The claim is specific, empirical, and well-supported by multiple studies confirming that ice crystals in clouds produce solar and lunar halos through the refraction and scattering of light.

Evidence for · 4

Halos in cirrus clouds: why are classic displays so rare?

Recorded source metadata

Sassen K. Halos in cirrus clouds: why are classic displays so rare?. 2005. https://doi.org/10.1364/ao.44.005684

Cirrus clouds consisting of hexagonal ice crystals are identified as the microphysical source that predictably produces optical phenomena such as 22-degree and 46-degree halos.

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More for · 3

Ice Crystal Characterization in Cirrus Clouds III: Retrieval of Ice Crystal Shape and Roughness from Observations of Halo Displays

Recorded source metadata

Linda Forster, Bernhard Mayer. Ice Crystal Characterization in Cirrus Clouds III: Retrieval of Ice Crystal Shape and Roughness from Observations of Halo Displays. 2022. https://doi.org/10.5194/acp-2022-128

Ground-based imaging of 22-degree and 46-degree halo displays confirms that ice crystal microphysical properties in clouds determine these optical rings.

Source citation format

Observations of Halo Scattering From Single Ice Crystals

Recorded source metadata

Antonino Pluchino. Observations of Halo Scattering From Single Ice Crystals. 1986. https://doi.org/10.1364/mo.1986.tha5

Ice crystal halos surrounding the sun and moon are established optical occurrences resulting from light-ice crystal interactions.

Source citation format

An Atlas of Refraction Halos

Recorded source metadata

Günther P. Können, Walter Tape. An Atlas of Refraction Halos. 1997. https://doi.org/10.1364/lcoa.1997.ltua.2

Refraction halos in ice crystals provide the basis for classifying the various rings and optical displays observed around the sky.

Source citation format

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first checked02 Aug 2026

judged → SUPPORTED · 7702 Aug 2026

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