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Instrument: MIR : Millimeter Imaging Radiometer
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The Millimetef-wave Imaging Radiometer (MIR) is a total-power
passive microwave radiometer with channels at frequencies of
89, 150, 183.3+-1, 183.3+-3, 183.3+-7, 220, and 325 GHz, and it
is used for measurements of atmospheric water vapor and
precipitation (Racette et al. 1995). For cloud and
precipitation regions, the channels on this instrument respond
primarily to scattering from ice regions of clouds, with the
lower free uencies penetrating progressively further into the
cloud. The 183 GHz and lower-frequency channels on NIIR are
currently flown on the SSMII and SSM/T2 spaceborne
instruments. The MIR instrument is located in the right ERA
wing superpod and scans S7 points cross-track +- 5Q? (each seen
cycle takes about 2.9 s)Ail channels have a beamwidth of
approximately 3.3? resulting in a spot size of about 0.5 km at
a 10 km altitude typical of the ice scattering region in
thunderstorms. The polarisation state of the measurements
rotates with scan angle such that at nad ir, the elecinc field
is perpendicular to the direction of flight.

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