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  • anisotropy
  • In forty minutes of observing, the radiometer can measure the anisotropy of the microwave background with an accuracy of {+-} 1 m{sup o}K rms, or about one part in 3000 of 3 K. The apparatus is flown in a U-2 jet to 20 km altitude where 33 GHz thermal microwave emission from the atmosphere is at a low level. (unt.edu)
  • past
  • The antennas, which have an extremely low side-lobe response of less than -65 dB past 60{sup o}, reject anisotropic radiation from the earth's surface. (unt.edu)