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Sunset science. I. The mock mirage.

A T Young, G W Kattawar, P Parviainen

    Applied Optics
    |April 20, 1997
    PubMed
    Summary
    This summary is machine-generated.

    A newly discovered mock mirage phenomenon creates inverted Sun and Moon images near the horizon due to thermal inversions. These atmospheric optical effects are independent of ducting and are more pronounced at higher observer altitudes.

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    Area of Science:

    • Atmospheric optics
    • Meteorology

    Background:

    • Optical phenomena near the horizon are often attributed to atmospheric refraction.
    • Thermal inversions, layers of warm air above cooler air, can significantly alter light paths.

    Purpose of the Study:

    • To identify and describe a previously unrecognized atmospheric optical phenomenon: the mock mirage.
    • To explain the optical principles behind mock mirages, differentiating them from other atmospheric effects.

    Main Methods:

    • Observational analysis of celestial bodies near the horizon.
    • Theoretical modeling of light ray paths through thermal inversions.
    • Distinguishing mock mirage features from wave-related optical phenomena.

    Main Results:

    • The mock mirage produces inverted images of the Sun and Moon near the horizon.
    • This phenomenon occurs when viewing downward through a thermal inversion, without ducting.
    • Image distortion increases with observer height and inversion severity.

    Conclusions:

    • The mock mirage is a distinct atmospheric optical phenomenon caused by thermal inversions.
    • Previously published photographs of this effect have been misinterpreted.
    • It is crucial to distinguish mock mirages from optical effects caused by waves on inversion layers.