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  2. Air mass (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Air_mass_(astronomy)

    When atmospheric refraction is considered, ray tracing becomes necessary (Kivalov 2007), and the absolute air mass integral becomes [7] = ⁡ where is the index of refraction of air at the observer's elevation above sea level, is the index of refraction at elevation above sea level, = +, = + is the distance from the center of the Earth to a ...

  3. Atmospheric optics - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_optics

    Meteorological optics is "that part of atmospheric optics concerned with the study of patterns observable with the naked eye". [2] Nevertheless, the two terms are sometimes used interchangeably. Meteorological optical phenomena, as described in this article, are concerned with how the optical properties of Earth's atmosphere cause a wide range ...

  4. Computation of radiowave attenuation in the atmosphere

    en.wikipedia.org/wiki/Computation_of_radiowave...

    Derivation of the optical invariant, a measure of the light propagating through an optical system. The document ITU-R pp. 676–78 of the ITU-R section considers the atmosphere as being divided into spherical homogeneous layers; each layer has a constant refraction index. By the use of trigonometry, a couple of formulas and an algorithm were ...

  5. Atmospheric refraction - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_refraction

    Diagram showing displacement of the Sun's image at sunrise and sunset Comparison of inferior and superior mirages due to differing air refractive indices, n. Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height. [1]

  6. Fried parameter - Wikipedia

    en.wikipedia.org/wiki/Fried_parameter

    The angular resolution is then limited to about / due to the effect of the atmosphere, whereas the resolution due to diffraction by a circular aperture of diameter is generally given as /. Since professional telescopes have diameters D ≫ r 0 {\displaystyle D\gg r_{0}} , they can only obtain an image resolution approaching their diffraction ...

  7. Optical window - Wikipedia

    en.wikipedia.org/wiki/Optical_window

    The optical atmospheric window is the optical portion of the electromagnetic spectrum that passes through the Earth's atmosphere, excluding its infrared part; [10] although, as mentioned before, the optical spectrum also includes the IR spectrum and thus the optical window could include the infrared window (8 – 14 μm), the latter is ...

  8. List of optics equations - Wikipedia

    en.wikipedia.org/wiki/List_of_optics_equations

    Image distance in a spherical mirror + = () Subscripts 1 and 2 refer to initial and final optical media respectively. These ratios are sometimes also used, following simply from other definitions of refractive index, wave phase velocity, and the luminal speed equation:

  9. Air mass (solar energy) - Wikipedia

    en.wikipedia.org/wiki/Air_mass_(solar_energy)

    The earth's atmosphere absorbs a considerable amount of the ultraviolet light. The resulting spectrum at the Earth's surface has fewer photons, but they are of lower energy on average, so the number of photons, above the bandgap, per unit of sunlight energy is greater than in space. This means that solar cells are more efficient at AM1 than AM0.

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