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Passive and active SETI strategies using the synchronization of SN1987A
A passive and active strategy for the reception and transmission of callsignals, from and to other possible extraterrestrial civilizations issuggested using the explosion of SN1987A. The reception area is anellipsoid with the Earth and the supernova in its focuses, in thedirection of SN1987A. Three hundred and forty objects have beenidentified inside this surface and four of them are stars withenvironments similar to our sun (e.g. necessary for the development oflife and intelligence). A search strategy to look for 'fake' pulsarssignals, originated in other possible technological civilizations, inthis direction, is examined. The active strategy consists in thetransmission of terrestrial signals towards the hyperboloid surface(with the same focuses) in the antipodal direction of the supernovaexplosion. Thirty-three objects have been identified inside thehyperboloid and three of them are solar-type nearby stars. Thetransmission characteristics of a terrestrial origin 'fake' pulsar (e.g.modulation, frequency, bandwidth, periods, duty cycle, etc.) arediscussed in some detail. The possible use of available planetary radarsto develop such a proposal and the criterion of artificiarity, withoutany implicit code or semantics is reviewed. A difference between activesearch and communication is established.
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