The Meteor-3 series of meteorological satellites provided twice-daily weather information including data on clouds, ice and snow cover, atmospheric radiation and humidity sounding. The Meteor-3 class of satellites orbited in a higher altitude than the Meteor-2 class of satellites and thus provided more complete coverage of the Earth's surface. The Meteor-3 had the same payload as the Meteor-2 but also included an advanced scanning radiometer with better spectral and spatial resolution and a spectrometer for determining total ozone content. The spacecraft incorporated three-axis stabilization (0.5 deg accuracy) and twin 10-m span solar panels. The orbit was adjusted by ion thrusters. Meteorological data was transmitted to four primary sites in the former Soviet Union in conjunction with about 80 other smaller sites. Internationally compatible Automatic Picture Transmission (APT) was made available on 137 - 138 MHz channels to ground workstations. The Meteor-3 had two 0.5 - 0.7 micron radiometers. The first provided direct relay with a swath width of 2600 km and a resolution of 1 x 2 km. The second stored data on an on-board data recorder which provided global coverage with a swath width of 3100 km and a resolution of 0.7 x 1.4 km. The payload also included a scanning IR radiometer at 10.5 - 12.5 microns with a swath width of 3100 km and a resolution of 3 x 3 km, and an 8-channel IR radiometer for atmospheric sounding at 9.65 - 18.7 microns with a swath width of 2000 km and a resolution of 32 x 32 km. The Meteor-3 also included a 4 channel UV ozone monitor (0.25 - 1.03 micron) at 2 km altitude resolution and a particle radiation detector (0.15 - 90 MeV).
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