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  2. Chappuis absorption - Wikipedia

    en.wikipedia.org/wiki/Chappuis_absorption

    The western twilight sky after sunset, during the blue hour (around nautical dusk).The deep-blue color of the upper portion is attributable to Chappuis absorption. Chappuis absorption (French:) refers to the absorption of electromagnetic radiation by ozone, which is especially noticeable in the ozone layer, which absorbs a small part of sunlight in the visible portion of the electromagnetic ...

  3. Optical spectrometer - Wikipedia

    en.wikipedia.org/wiki/Optical_spectrometer

    If the instrument is designed to measure the spectrum on an absolute scale rather than a relative one, then it is typically called a spectrophotometer. The majority of spectrophotometers are used in spectral regions near the visible spectrum. A spectrometer that is calibrated for measurement of the incident optical power is called a ...

  4. File:Spectrum.pdf - Wikipedia

    en.wikipedia.org/wiki/File:Spectrum.pdf

    Original file (1,650 × 1,275 pixels, file size: 3.79 MB, MIME type: application/pdf) This is a file from the Wikimedia Commons . Information from its description page there is shown below.

  5. Multifractal system - Wikipedia

    en.wikipedia.org/wiki/Multifractal_system

    One practical multifractal spectrum is the graph of D Q vs Q, where D Q is the generalized dimension for a dataset and Q is an arbitrary set of exponents. The expression generalized dimension thus refers to a set of dimensions for a dataset (detailed calculations for determining the generalized dimension using box counting are described below ).

  6. Colors of noise - Wikipedia

    en.wikipedia.org/wiki/Colors_of_noise

    Brown spectrum (−6.02 dB per octave) Brownian noise, also called Brown noise, is noise with a power density which decreases 6.02 dB per octave (20 dB per decade) with increasing frequency (frequency density proportional to 1/f 2) over a frequency range excluding zero . It is also called "red noise", with pink being between red and white.

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  8. Lyman-alpha forest - Wikipedia

    en.wikipedia.org/wiki/Lyman-alpha_forest

    The Lyman-alpha forest was first discovered in 1970 by astronomer Roger Lynds in an observation of the quasar 4C 05.34. [1] Quasar 4C 05.34 was the farthest object observed to that date, and Lynds noted an unusually large number of absorption lines in its spectrum and suggested that most of the absorption lines were all due to the same Lyman-alpha transition. [2]

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