Astrophysics and Space Science

, Volume 66, Issue 2, pp 349–352 | Cite as

Seasonal atmospheric extinction

  • J. S. Mikhail


Mean monochromatic extinction coefficients at various wavelengths at the Kottamia Observatory site have shown the existence of a seasonal variation of atmospheric extinction. The extinction of aerosol components with wavelengths at winter represent exceedingly good conditions. Spring gives the highest extinction due to aerosol.


Seasonal Variation Extinction Coefficient Good Condition High Extinction Observatory Site 
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  1. Abbott, C. G.: 1911,The Sun, Appleton, New York.Google Scholar
  2. Hodge, P. W.: 1971,Nature 229, 549.Google Scholar
  3. Mikhail, J. S.: 1979,Helwan Obs. Bull. (in press).Google Scholar

Copyright information

© D. Reidel Publishing Co. 1979

Authors and Affiliations

  • J. S. Mikhail
    • 1
  1. 1.Helwan Institute of Astronomy and GeophysicsCairoEgypt

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