Program: Tiros
Television and Infra Red Observation Satellite
American meteorological program
In 1960,
Tiros 1,
the first true weather satellite, was launched. With each succeeding generation
of satellites, remote sensing instruments became increasingly sophisticated and
today's high quality pictures are a far cry from the first tentative trials.
TIROS was a simple hatbox-shaped craft carrying special television cameras that
viewed Earth's cloud cover from a 450 mile orbit. The pictures radioed back to
Earth provided meteorologists with a new tool - a nephanalysis, or cloud
chart.
By 1965, nine more TIROS satellites were launched. They had progressively
longer operational times, carried infrared radiometers to study Earth's heat
distribution, and several were placed in polar orbits to increase picture
coverage over the first TIROS in its near-equatorial orbit.
TIROS 8 had the first Automatic Picture Transmission (APT) equipment that
allowed pictures to be sent back right after they were taken instead of having
to be stored for later transmission. Eventually, APT pictures could be received
on fairly simple ground stations anywhere in the world, even in high school
classrooms.
TIROS 9 and 10 were test satellites of improved configurations for the Tiros
Operational Satellite (TOS) system. Operational use started in 1966. In orbit,
the TOS satellites were called
ESSA.
TOS satellites were placed in Sun-synchronous orbits, so they passed over the
same position on Earth's surface at exactly the same time each day; this
allowed meteorologists to view local cloud changes on a 24-hour basis.
Several
ITOS
(for Improved TOS satellites) have been launched since 1970 and are the
workhorses of the meteorologists. In orbit they are called
NOAA
for the National Oceanographic and Atmospheric Administration which is
responsible for their operation.
http://www.met.fsu.edu/explores/Guide/tirosindex.html