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    Area of Science:

    • * Atmospheric Optics
    • * Solar Physics
    • * Computational Astrophysics

    Background:

    • *
    • Thin, wavy ribbons of light, known as
    • shadow bands
    • , are observable phenomena preceding and following total solar eclipses.
    • * Previous theoretical work by Codona (1986) attributed shadow bands to atmospheric turbulence within the lower 2-3 km of the atmosphere, utilizing scattering scintillation theory.

    Purpose of the Study:

    • * To propose and validate a numerical wave optics simulation approach for modeling the shadow band phenomenon.
    • * To investigate the contribution of atmospheric turbulence at different heights to shadow band intensity scintillation.

    Main Methods:

    • * Development of a numerical wave optics simulation.
    • * Modeling a crescent-shaped solar source and the propagation of plane waves through simulated atmospheric turbulence phase screens.
    • * Observation and analysis of light intensity patterns at ground level.

    Main Results:

    • * The simulation successfully reproduces intensity patterns and temporal evolution consistent with observed shadow bands and Codona's theory.
    • * Simulated scintillation index as a function of turbulence height shows excellent agreement with theoretical predictions.
    • * The simulation demonstrates the impact of wind on the temporal dynamics of shadow band patterns.

    Conclusions:

    • * Numerical wave optics simulation provides a viable method for studying shadow band phenomena.
    • * The simulation confirms the role of lower atmospheric turbulence in generating shadow bands.
    • * The adaptable simulation approach can be applied to other atmospheric turbulence and imaging problems involving extended incoherent sources.