Observations of Zodiacal Light at Abu-Simbel, Egypt, during the Period 1975–1979

  • A. S. Asaad
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 96)


The curves published by Weinberg (1964) indicated the existance of large discrepancies between measured brightness and polarization of Zodical Light (ZL) published by different observers. This could be partially explained by the solar activity, in such a way, that the brightness increased with decreasing solar activity while the polarization behaved in the opposite sence. Such relations were noted by Asaad (1967) and by Dufay (1966) and Weill (1966). Besides Asaad et al. (1979 a) found that the brightness of the ZL was higher if observed from low geographical latitudes by about 30% for a latitude difference of 10o. They also noted that the brightness was higher by 50% for an increase in the elevation of the observing site above sea level by about 8000 feet.


Solar Activity Solar Cycle Colour Index High Solar Activity Minimum Solar Activity 
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  1. Assad, A.S.: 1967, Observatory 87, 83.ADSGoogle Scholar
  2. Asaad, A.S.: 1967, Nature, 214, 259.ADSCrossRefGoogle Scholar
  3. Assad, A.S., Mikhael, J.S., Nawar,S.: 1979a, Helwan Obs. Bull. No. 204;Google Scholar
  4. Assad, A.S., Mikhael, J.S., Nawar, S.: 1979b, Helwan Obs. Bull. No. 203.Google Scholar
  5. Burnett, G.B.: 1976, Interplanetary dust and ZL, Lecture notes in Phys. No. 48, ed. by Elsasser, H. and Fechig, H., 53.Google Scholar
  6. Divari, N.B.: 1964, Sov. Ast. 7, 547.ADSGoogle Scholar
  7. Dufay, J.: 1966, Comptes Rendus 263, 947.Google Scholar
  8. Kudo, S. and Wada, M.: 1968, Eleven years variations of cosmic ray intensity, Report of Ionosphere and Space Res., Japan, 22, No. 3, 137.Google Scholar
  9. Regner, V.H. and Vande Noord, E.L.: 1967, Nasa SP-150 ed. by Weinberg, J.L., 45.Google Scholar
  10. Vande Noord, E.L.: 1970, Astrophys, J., 161, 309.ADSCrossRefGoogle Scholar
  11. Weill, M.G.: 1966, Comptes Rendus, 263, 943.Google Scholar
  12. Weinberg, J.L.: 1964, Summary Report on ZL, Hawaii Inst. of Geophys. July.Google Scholar

Copyright information

© D. Reidel Publishing Company 1982

Authors and Affiliations

  • A. S. Asaad
    • 1
  1. 1.Institute of Astronomy and GeophysicsEgypt

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