Antitwilight arch: Difference between revisions
From Glossary of Meteorology
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|Meaning= | |Meaning=A bright wedge of pink, orange, or [[purple light]] that extends around the antisolar [[horizon]] during [[clear]] twilights and that has the greatest vertical width (∼3°–6°) occurring above the [[antisolar point]]. | ||
A bright wedge of pink, orange, or [[purple light]] that extends around the antisolar [[horizon]] during [[clear]] twilights and that has the greatest vertical width (∼3°–6°) occurring above the [[antisolar point]]. | |Explanation=The antitwilight arch rises with the antisolar point at [[sunset]] and sets with the antisolar point at [[sunrise]]. The antitwilight arch is brighter than the bluish gray [[dark segment]] beneath it. The boundary between these features may be distinct shortly after sunset (sun [[elevation]] ''h''<sub>0</sub> ∼ -2°), but it fades as evening [[twilight]] progresses. | ||
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Latest revision as of 21:28, 13 January 2024
A bright wedge of pink, orange, or purple light that extends around the antisolar horizon during clear twilights and that has the greatest vertical width (∼3°–6°) occurring above the antisolar point.
The antitwilight arch rises with the antisolar point at sunset and sets with the antisolar point at sunrise. The antitwilight arch is brighter than the bluish gray dark segment beneath it. The boundary between these features may be distinct shortly after sunset (sun elevation h0 ∼ -2°), but it fades as evening twilight progresses.
