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Análisis del brillo artificial del cielo mediante modelos

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Análisis del brillo artificial del cielo mediante modelos. Salvador Bará, Universidad de Santiago de Compostela. “Encuentro Internacional Para la Defensa de la Oscuridad Natural de la Noche" celebrado en Almería el día 27 de abril de 2018.

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Análisis del brillo artificial del cielo mediante modelos

  1. 1. Salva Bará salva.bara@usc.es Área de Óptica, Dept. Física Aplicada. Facultade de Óptica e Optometría Universidade de Santiago de Compostela. Galicia. http://webspersoais.usc.es/persoais/salva.bara/ Models for the analysis of artificial sky brightness
  2. 2. DISCLAIMER This presentation is intended for educational, non-commercial use. Trademarks, models and publications are quoted here merely for informative purposes, without any explicit or implicit endorsement by the Universidade de Santiago de Compostela (USC). (c) Images may have external copyright.
  3. 3. 1. "Sky brightness": what is it? 2. A highly variable magnitude 3. Modeling the night sky brightness 4. Challenges for the next years
  4. 4. 1. "Sky brightness": what is it?
  5. 5. "Brightness"
  6. 6. propagation scattering absorption MEDIATED BY: Molecules Aerosols NATURAL SOURCES including airglow ARTIFICIAL SOURCES
  7. 7. Analyzing artificial sky brightness Measuring TOTAL sky brightness and subtracting the NATURAL one Computing the ARTIFICIAL sky brightness with LP propagation models
  8. 8. 2. A highly variable magnitude
  9. 9. Variable light emissions
  10. 10. Variable light emissions Changing atmospheric conditions
  11. 11. Variable light emissions Changing atmospheric conditions Changes in recorded brightness
  12. 12. Parameter(s) of choice...? - Significant magnitude m1/3
  13. 13. Parameter(s) of choice...? - Significant magnitude m1/3 - Moonlight modulation factor
  14. 14. Parameter(s) of choice...? - Significant magnitude m1/3 - Moonlight modulation factor
  15. 15. 3. Modeling the night sky brightness
  16. 16. A. Models for predicting the NSB • Two-stream approximation • Iterative approach to Radiative Transfer Equation (RTE) • Successive Orders of Scattering
  17. 17. Falchi et al, 2016
  18. 18. Fernando Patat, http://cosmicdiary.org/fpatat/2009/12/02/the-shadow-of-the-earth-lombra-della-terra/ Multiple scattering: the shadow of the Earth
  19. 19. Fernando Patat, http://cosmicdiary.org/fpatat/2009/12/02/the-shadow-of-the-earth-lombra-della-terra/ Multiple scattering: the shadow of the Earth credit: Sky and Telescope
  20. 20. Kocifaj, 2018
  21. 21. B. Models for analyzing the NSB
  22. 22. C. Using the analysis for prediction (1)
  23. 23. C. Using the analysis for prediction (2)
  24. 24. C. Using the analysis for prediction (3)
  25. 25. 4. Challenges for the next years
  26. 26. 4. Challenges for the next years • Extending the measurement networks
  27. 27. Rede Galega de Medida do Brillo do Ceo Nocturno
  28. 28. • (Re)Conocer la extensión del problema
  29. 29. 4. Challenges for the next years • Extending the measurement networks • Multispectral satellite platforms
  30. 30. (c) NASA-suomi NPP Oct.2012 (VIIRS)
  31. 31. ISS Jul. 26, 2014. Nikon D3S/24mm.
  32. 32. 4. Challenges for the next years • Extending the measurement networks • Multispectral satellite platforms • Agreeing common NSB descriptors
  33. 33. 4. Challenges for the next years • Extending the measurement networks • Multispectral satellite platforms • Agreeing common NSB descriptors • Developing parametric NSB models
  34. 34. 4. Challenges for the next years • Extending the measurement networks • Multispectral satellite platforms • Agreeing common NSB descriptors • Developing parametric NSB models • Issuing recommendations and ordinances

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