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Northern Hemisphere SSM/I brightness temperature data (descending passes only) for 01 January 2008
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Arctic sea ice concentration
Monthly-averaged percent sea ice concentration for September 2007 derived from Nimbus-7 SMMR and DMSP SSM/I-SSMIS passive microwave data.
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Polar grids
Grid extents for SSM/I, TOVS Polar (purple box), and AVHRR (orange box).
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Snow melt onset
1998 snow melt onset over Arctic sea ice from SMMR and SSM/I-SSMIS brightness temperatures.
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SMMR and SSM/I-SSMIS Overview

NSIDC archives and distributes daily and monthly data derived from the Special Sensor Microwave Imager/Sounder (SSMIS), the Special Sensor Microwave/Imager (SSM/I), and the Scanning Multichannel Microwave Radiometer (SMMR). Together, these passive microwave sensors offer an extensive data record which spans from 1978 through the present. The products derived from these sensors are offered in two flexible and easy-to-use projections: EASE-Grid and Polar Stereographic.