Infrared radiometry on board Mars-5

Details Infrared radiometry on board Mars-5 Infrared radiometry on board Mars-5

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975stin...7524621k&link_type=abstract

Infrared radiometry on board Mars-5 NASA Transl. into ENGLISH from Kosm. Issled. (USSR), v. 13, no. 1, Jan.-Feb. 1975 p 77-79

Physics

Infrared Radiometers, Mars Atmosphere, Mars Probes, Brightness Temperature, Mars Surface, Planetary Radiation, Rocket-Borne Instruments

Scientific paper

The IRM-73 radiometer aboard the Mars-5 planetary probe was intended to measure the brightness temperature of the planet's surface in the range of 110-300 K. Its optical diagram and description are included. The directivity pattern of the radiometer is about 1 deg, corresponding to the portion of the surface with a 35 km diameter at the pericenter. The spectral range of the radiometer is 8 to 26 micrometer, with the 14-17 micrometer band rejected to avoid errors caused by CO2 in the Martian atmosphere. Measurement results are shown in the form of a curve presenting the variation of brightness temperatures along the track of 23 February 1974. The maximum recorded temperature is 272 K. In the vicinity of the terminator, the temperature drops to 230 deg; and at the end of the track, it drops to 200 K.

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