Astrophysics and Space Science

, Volume 111, Issue 1, pp 179–188 | Cite as

Long and short term variation of the 10.7 cm solar flux. The photospheric granules and the Zürich numbers

  • John Xanthakis
  • Constantine Poulakos


Based on diurnal values of the total radio-flux density at 10.7 cm as well as on corresponding Zürich numbers the relation giving the radio-flux as function ofR is established. The behaviour of low and high values ofR andF2800 during the time interval 1957–1976 is studied. Preliminary conclusions drawn by other investigators are confirmed. A prediction of the total radio-flux for the 22nd solar cycle is given.


Solar Cycle Term Variation Short Term Variation Preliminary Conclusion Solar Flux 
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  1. Allen, C. W.: 1957,Monthly Notices Roy. Astron. Soc. 117, 174.Google Scholar
  2. Castelli, J., Basu, S., an Aarons, J.: 1965, in S. L. Valley (ed.), ‘Solar Radio-Emission’,Handbook of Geophysics and Space Environments, McGraw-Hill Book Co., New York, p. 16.Google Scholar
  3. Coffey, H.: 1976–1984,Solar-Geophysical Data Prompt. Reports.Google Scholar
  4. Covington, A. F. and Harvey, G. A.: 1960,Astrophys. J. 132, 435.Google Scholar
  5. Covington, A. E.: 1972,J. Roy. Astron. Soc. Can. 63, 125.Google Scholar
  6. Covington, A. E.: 1974,J. Roy. Astron. Soc. Can. 68, 31.Google Scholar
  7. Covington, A. E.: 1976,J. Roy. Astron. Soc. Can. 72, 335.Google Scholar
  8. Das Gupta, M. K. and Basu, D.:Nature 203, 626.Google Scholar
  9. Dodson, H. W. and Hedeman, E. R.: 1975,Solar Phys. 42, 121.Google Scholar
  10. Kendal, M. C.: 1958,The Advanced Theory of Statistics, C. Griffin Ltd., London.Google Scholar
  11. Macris, C. J. and Rösch, J.: 1983,Compt. Rend. Acad. Sci. Paris 296, 265.Google Scholar
  12. Vitinsky, Yu. I.: 1973,Cycles and Forecasting of Solar Activity, Nauka, Moscow.Google Scholar
  13. Vitinsky, Uu. I.: 1976,Solnechnye Dannye, No. 11, pp. 59–63.Google Scholar
  14. Waldmeier, M.: 1971,Astron. Mitt. Eidgen, Sternwarte Zürich, No. 304.Google Scholar
  15. Xanthakis, J. N.: 1966,Prakt. de l'Académie d'Athènes, p. 41.Google Scholar
  16. Xanthakis, J. N.: 1967a, in J. Xanthakis (ed.),Solar Physics, J. Wiley and Sons Ltd., London.Google Scholar
  17. Xanthakis, J. N.: 1967,Nature 215, 1048.Google Scholar

Copyright information

© D. Reidel Publishing Company 1985

Authors and Affiliations

  • John Xanthakis
    • 1
  • Constantine Poulakos
    • 1
  1. 1.Research Center for Astronomy and Applied MathematicsAcademy of AthensGreece

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