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The new GPM Microwave Imager, or GMI, produced

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unprecedented images of an extra-tropical cyclone in the Northwest 

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Pacific Ocean, east of Japan, on March 10, 2014.

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The GMI measures the natural energy radiated by

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different precipitation in the form of brightness temperatures.

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The GMI produces a critical reference standard, which unifies all the member

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satellites of the GPM Constellation. The instrument

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has 13 channels, four more than onboard TRMM, and this

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greater sensitivity allows GPM to measure a greater variety of

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precipitation type and intensity. Each channel

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has a frequency range that can detect a different type of precipitation.

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The lower frequencies for moderate to heavy rain,

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the middle frequencies for a mix of rain and snow,

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and the higher frequencies for falling snow and ice.

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Scientific algorithms then translate the

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GMI's brightness temperature data into more meaningful products, such as

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rain rates. Because GPM's coverage extends beyond

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the tropics, measuring storms like these in the mid- and high-latitudes

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will improve and expand the global view of precipitation.

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[rain falling]

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[rain falling]

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