Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Appl Opt. 2011 Oct 1;50(28):F152-61. doi: 10.1364/AO.50.00F152.

Visibility of natural tertiary rainbows.

Author information

  • 1Mathematics and Science Division, United States Naval Academy, Annapolis, Maryland 21402, USA. raylee@usna.edu

Abstract

Naturally occurring tertiary rainbows are extraordinarily rare and only a handful of reliable sightings and photographs have been published. Indeed, tertiaries are sometimes assumed to be inherently invisible because of sun glare and strong forward scattering by raindrops. To analyze the natural tertiary's visibility, we use Lorenz-Mie theory, the Debye series, and a modified geometrical optics model (including both interference and nonspherical drops) to calculate the tertiary's (1) chromaticity gamuts, (2) luminance contrasts, and (3) color contrasts as seen against dark cloud backgrounds. Results from each model show that natural tertiaries are just visible for some unusual combinations of lighting conditions and raindrop size distributions.

PMID:
22016239
[PubMed]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Loading ...
    Write to the Help Desk