SP-419 SETI: The Search for Extraterrestrial Intelligence
![Portion of output scan from 1024 channel ( of 1 KHz each) analyzer at Arecibo Observatory showing an ETI search, centered on HI line, with a [alpha]-Ophinchi as the target. Structure shown is due to interstellar hydrogen clouds at various drift velocities. Bar indicates strength of hypothetical signal that could be received from a transmitter with the EIRP of Arecibo, located at the 60 Iy distance of a [alpha]-Ophiuchi.](p15.jpg)
Portion of output scan from 1024
channel ( of 1 KHz each) analyzer at Arecibo Observatory showing an
ETI search, centered on HI line, with a [alpha]-Ophinchi as the
target. Structure shown is due to interstellar hydrogen clouds at
various drift velocities. Bar indicates strength of hypothetical
signal that could be received from a transmitter with the EIRP of
Arecibo, located at the 60 Iy distance of a [alpha]-Ophiuchi.
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