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Astrophysics and Space Science

, Volume 214, Issue 1–2, pp 209–223 | Cite as

Passive and active seti strategies using the synchronization of SN1987A

  • Guillermo A. Lemarchand
Article

Abstract

A passive and active strategy for the reception and transmission of call signals, from and to other possible extraterrestrial civilizations is suggested using the explosion of SN1987A. The reception area is an ellipsoid with the Earth and the supernova in its focuses, in the direction of SN1987A. Three hundred and forty objects have been identified inside this surface and four of them are stars with environments similar to our sun (e.g. necessary for the development of life and intelligence). A search strategy to look for “fake” pulsars signals, originated in other possible technological civilizations, in this direction, is examined.

The active strategy consist in the transmission of terrestrial signals towards the hyperboloid surface (with the same focuses) in the antipodal direction of the supernova explosion. Thirty-three objects have been identified inside the hyperboloid and three of them are solar-type nearby stars. The transmission characteristics of a terrestrial origin “fake” pulsar (e.g. modulation, frequency, bandwidth, periods, duty cycle, etc.) are discussed in some detail. The possible use of available planetary radars to develop such proposal and the criterion of artificiality, without any implicit code or semantics is reviewed. A difference between active search and communication is established.

Keywords

Radar Search Strategy Duty Cycle Active Strategy Active Search 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Almár, I. and Hilton, W.H.: 1988 in: G. Marx (ed.),Bioastronomy: The Next Steps, Kluwer Academic Publishers, Dordrecht, p. 377.Google Scholar
  2. Arnett, W.D.et al.: 1989,Ann. Rev. of Astron. Astrophys. 27, 629–670.Google Scholar
  3. Backus, P.R.: 1993, paper presented at the National Radio Science Meeting, University of Colorado, Colorado, USA, p.219 (abstract).Google Scholar
  4. Bates, D.R.: 1978,Astrophys. Space Sci. 55, 7–13.Google Scholar
  5. Bahcall, J.N. and Soneira, R.M.: 1980,Astrophys. J. Suppl. Ser. 44, 73–110.Google Scholar
  6. Cocconi, G. and Morrison P.: 1959,Nature 184, 844–846.Google Scholar
  7. Cordes, J.M. and Lazio, T.J.: 1991,Astrophys. J. 376, 123–134.Google Scholar
  8. Colomb, F.R.et al.: 1993, ASP Conference Series47, pp. 279–288.Google Scholar
  9. Colomb, F.R., Martín, M.C. and Lemarchand, G.A.: 1992,Acta Astronautica 26, 211–212.Google Scholar
  10. Cullers, D.K.: 1986,Acta Astronautica 13, 31–37.Google Scholar
  11. Dixon, R.S.: 1973,Icarus 20, 187–199.Google Scholar
  12. Drake, F.D., Wolfe, J.H. and Seeger, C.L. (eds.): 1983, NASA Technical Paper 2244, p. 5.Google Scholar
  13. Drake, F.D.: 1978, in: C. Saganet al. (eds.),Murmurs of Earth, Random House, New York.Google Scholar
  14. Freudenthal, H.: 1960,Lincos: A Design Language for Cosmic Intercourse, North Holland Publ. Co., Amsterdam.Google Scholar
  15. Hogben, L.: 1952,J. Brit. Interplanet. Soc. 11, 258–274.Google Scholar
  16. Hoerner, S. von: 1961,Science 134, 1839–1843.Google Scholar
  17. Horowitz, P. and Sagan, C.: 1993,Astrophys. J. 415, 218–235.Google Scholar
  18. Lemarchand, G.A. and Tarter, D.E.: 1994,Space Policy (in press).Google Scholar
  19. Malofeev, V.M. and Shitov, Yu.P.: 1981,Astrophys. Space Sci. 78, 45–72.Google Scholar
  20. Makovetskii, P.V.: 1977,Soviet Astronomy 21(2), 251–253.Google Scholar
  21. Makovetskii, P.V.: 1980,Icarus 41, 178–192.Google Scholar
  22. McCulloch, P.M.et al.: 1983,Nature 303, 307–308.Google Scholar
  23. McLaughlin, W.I.: 1977,Icarus 32, 464–470.Google Scholar
  24. Michel, F.C., Kennel, C.F. and Fowler, W.A.: 1987,Science 238, 938–940.Google Scholar
  25. Pace, G.W. and Walker, J.C.G.: 1975,Nature 254, 400–401.Google Scholar
  26. Price, R.M. (ed.): 1989,Radio Astronomy Observatories, National Academy Press, Washington.Google Scholar
  27. Schwarzschild, B.: 1991,Phys. Today 44(2), 20.Google Scholar
  28. Seeger, C.L.: 1977, in: P. Morrison, J. Billingham and J. Wolfe (eds.),The Search for Extraterrestrial Intelligence, NASA SP-419, p. 125.Google Scholar
  29. Seward, F.D.et al.: 1984,Astrophys. J. Letters287, L19-L22.Google Scholar
  30. Shabad, A.E. and Usov, V.V.: 1984,Astrophys. Space Sci. 102, 327–358.Google Scholar
  31. Shklovskii, I.S. and Sagan, C.: 1966,Intelligent Life in the Universe, Holden-Day Inc., San Francisco.Google Scholar
  32. Solderblom, D.R. and Latham D.W.: 1993, ASP Conference Series47 pp. 231–248.Google Scholar
  33. Sullivan III, W.T., Brown, S. and Wetherill, C.: 1978,Science 199, 377–388.Google Scholar
  34. Sullivan III, W.T.: 1978,Science 202, 376.Google Scholar
  35. Sullivan III, W.T.: 1991, in: J. Heidemann and M. Klein (eds.),Bioastronomy: The Search Broadens, Springer Verlag, New York, pp. 259–268.Google Scholar
  36. Tang, T.B.: 1976,J. Brit. Interplanet. Soc. 29, 469–470.Google Scholar
  37. Taylor, J.H. and Stinebring, D.R.: 1986,Ann. Rev. Astron. Astrophys. 24, 285–327.Google Scholar
  38. The Staff at the National Astronomy and Ionosphere Center: 1975,Icarus 26, 462–466.Google Scholar
  39. Turtle, A.J.et al.: 1987,Nature 327, 38–40.Google Scholar

Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Guillermo A. Lemarchand
    • 1
  1. 1.Center for Radiophysics and Space ResearchCornell UniversityIthacaUSA

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