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  • 1
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    Searching for extraterrestrial intelligence - The ultimate exploration (1977)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: A survey highlighting the central issues of the SETI program (Search for Extraterrestrial Intelligence), including its rationale, scope, search problems, and goals is presented. Electromagnetic radiation is suggested as the most likely means via which knowledge of extraterrestrial intelligence will be obtained, and the variables governing these signals are discussed, including: signal frequency and polarization, state, possible coordinates, and signal duration. The modern history of SETI and NASA's involvement is briefly reviewed, and the search strategies used by the Jet Propulsion Laboratory and the Ames Research Center are discussed and compared. Some of the potential scientific and cultural impacts of the SETI program are mentioned, noting advancements in technological, biological, and chemical research.
    Keywords: SPACE SCIENCES (GENERAL)
    Type: Mercury; 6; July-Aug
    Format: text
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  • 2
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    Recent SETI observations at Arecibo (1982)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: Preliminary results are presented for a high-resolution search for narrowband signals from the direction of 210 nearby solar-type stars and five OH masers. The 305-m Arecibo radio telescope was used to seek narrowband radio emission at frequencies surrounding the 21-cm H I line and/or the 18-cm OH lines; the observations were made in right and left circular polarizations simultaneously. At the 98% level, 291 'birdies' were found, of which six sources at 18 cm and eight at 21 cm are considered potential candidates for reobservation and further study to identify the nature of the signals. It is noted that: (1) five of the 21-cm 'birdies' are probably H I clouds along the line of sight; (2) some of the 18-cm 'birdies' are associated with the extreme 13 frequency bands bordering unprotected bands above and below the established radio astronomy band; and (3) one of the 21-cm 'birdies' is distinctly narrowband and has no signal detected in the 'off' source.
    Keywords: SPACE SCIENCES (GENERAL)
    Type: IAF PAPER 82-263
    Format: text
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  • 3
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    A high-sensitivity search for extraterrestrial intelligence at lambda 18 cm (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A targeted high-sensitivity search for narrow-band signals near a wavelength of 18 cm has been conducted using the 91-m radiotelescope of the National Radio Astronomy Observatory. The search included 201 nearby solar-type stars and achieved a frequency resolution of 5.5 Hz over a 1.4-MHz bandwidth. This high spectral resolution was obtained through a non-real-time reduction procedure using a Mark I VLBI recording terminal in conjunction with the CDC 7600 computational facility at the NASA-Ames Research Center. This is the first high-resolution search for narrow-band signals in this wavelength regime. To date it is the most sensitive search per unit observing time of any search strategy which does not postulate a unique magic frequency. Data show no evidence for narrow-band signals due to extraterrestrial intelligence at a 12-standard-deviation upper limit on signal strength of 1.1 x 10 to the -23rd W/sq m.
    Keywords: SPACE SCIENCES (GENERAL)
    Type: Icarus; 42; Apr. 198
    Format: text
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  • 4
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    SETI - A preliminary search for narrowband signals at microwave frequencies (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: In the search for intelligent signals of extraterrestrial origin, certain forms of signals merit immediate and special attention. Extremely narrowband signals of spectral width similar to our own television transmissions are most favored energetically and least likely to be confused with natural celestial emission. A search of selected stars has been initiated using observational and data processing techniques optimized for the detection of such signals. These techniques allow simultaneous observation of 10 to the 5th to 10 to the 6th channels within the observed spectral range. About two hundred nearby (within 80 LY) solar type stars have been observed at frequencies near the main microwave transitions of the hydroxyl radical. In addition, several molecular (hydroxyl) masers and other non-thermal sources have been observed in this way in order to uncover any possible fine spectral structure of natural origin and to investigate the potential of such an instrument for radioastronomy.
    Keywords: SPACE SCIENCES (GENERAL)
    Type: Plenary Meeting; Jun 07, 1977 - Jun 18, 1977; Tel Aviv; Israel
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  • 5
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    SETI - High sensitivity searches at NASA with high speed tape recorders (1979)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: The paper reports the two observing programs conducted to compare two techniques which have been proposed as methods for performing the requisite Fourier transformations in very large multichannel spectrum analysers (MCSA): the direct digital FFT and optical transform processor. The details of the observations at NRAO utilizing a direct digital FFT are given. A description of the NAIC, Arecibo observations utilizing an optical processor at the Environmental Research Institute of Michigan (ERIM) and a microdensitometer at Electromagnetics System Laboratories (ESL) is presented. For both observing programs, statistical analysis of the power spectra produced by the nonreal-time MCSAs (or post-processing) was accomplished.
    Keywords: SPACE SCIENCES (GENERAL)
    Type: IAF PAPER 79-A-43 , International Astronautical Federation, International Astronautical Congress; Sept. 17-22, 1979; Munich
    Format: text
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