A targeted search of some 1000 solar-type stars over 2 billion channels
between 1000 and 3000 MHz. The project rose from the ashes of the
NASA High Resolution Microwave Survey (cancelled by Congress in 1993), and
is now privately funded. The project has used telescopes in Australia,
West Virginia, Georgia (Georgia Tech's
Woodbury Research Facility),
and, most recently, the Arecibo telescope in Puerto Rico.
By mid-1999, Phoenix had examined approximately one-half
of the stars on its "hit list" but no clearly extraterrestrial
transmissions have been found.
"Billion-channel Extra-Terrestrial Assay," an all-sky monitor
investigation by Paul Horowitz of Harvard University (using a
26-m radio telescope, 1995 - 1999) with funding from the
Planetary Society.
Any particular source in the band surveyed
will be monitored for 8 seconds each year; what about intermittent signals?
The "Search for Extraterrestrial Radio Emissions from Nearby Developed
Intelligent Populations" looks for narrow-band signals near the
hydrogen line. The instrument operates in "piggy-back" mode at the
Arecibo telescope to record the signals from wherever the telescope
happens to be pointing.
There is a huge amount of data, and the analysis is shared
among millions of small computers through a volunteer program
called
SETI@home.
An array of 350 antennas of 6-m diameter each
manufactured by the makers of satellite dishes, resulting in an instrument with a
collecting area exceeding that of a 100 m telescope. Will allow a much wider
directed search.