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OverviewDuring the summer of 1999, the 21 and 37 GHz channels of AMMR (Airborne Multichannel Microwave Radiometer) were installed in the University of Washington Convair 580 aircraft and flown in the region near Marshall Islands in support of TRMM Kwajex. This two-channel component of the AMMR was viewing at a 45° angle from zenith. Both up-looking channels functioned normally during the whole deployment (not including the periods of aircraft breakdown). During the data processing and quality check, we discovered that the 21 GHz channel was not stable. The data from that channel appeared to drift with time during the flight and shall be used only with caution. The data are given in text format tagged with date and time, which are synchronized with those of the aircraft. When functioning normally, the calibrated brightness temperatures are estimated to be accurate to within ±4K. SponsorThe distribution of these data sets is funded by NASA's Earth Science Enterprise. The data are not copyrighted; however, we request that when you publish data or results using these data, please acknowledge as follows: The authors wish to thank Dr. James Wang, NASA/Goddard and Dr. Thomas Wilheit, Texas A and M University, for the production of these data and the Distributed Active Archive Center(Code 610.2) at the Goddard Space Flight Center, Greenbelt, MD, 20771, which archives and distributes them under sponsorship of NASA's Earth Science Enterprise. Instrument Information
Mission and Objectives. AMMR measures thermal microwave emission (in degrees Kelvin of brightness temperature) from surface and atmosphere. For KWAJEX, the AMMR, at 21 and 37 GHz, was used to measure hydrometeors associated with tropical convective systems. Geometry.AMMR is a single-beam, microwave radiometer operating at 21 and 37 GHz, both viewing through a window of the aircraft, with an incidence angle of 45o from zenith when the aircraft was on level flight. Following are the key components of these sensor assemblies and their characteristics:
The Data
The AMMR instrument was operational for the 15 mission flights of the University of Washington Convair during the KWAJEX Campaign. The Files
The AMMR data files are ascii text formatted as follows: yy mm dd hour min sec 21U 37U 99 8 24 2 2 10 168.6 105.2 99 8 24 2 2 11 168.2 104.7 99 8 24 2 2 12 168.0 104.6 99 8 24 2 2 13 167.8 104.1 99 8 24 2 2 14 167.0 103.2 99 8 24 2 2 15 166.5 102.7 99 8 24 2 2 16 166.0 102.3 Naming Convention AMMR file names are of the form
Data AccessThe AMMR data from KWAJEX may be accessed from this page, 
logon: anonymous passwd: cd http://disc.sci.gsfc.nasa.gov/data/KWAJ/aircraft/uw_convair/ammr
Points of ContactFor detailed information on instrument and data contact:James R. Wang Code 975, NASA Goddard Space Flight Center Greenbelt, MD 20771 wang@sensor2.gsfc.nasa.gov (301) 301-614-5655 (voice) (301) 301-614-5558 (fax) Co-Investigator: For additional information, please contact the GES DISC User Services:
GES DISC User Services
Code 610.2 NASA Goddard Space Flight Center Greenbelt, MD 20771 301-614-5224 Email: help-disc@listserv.gsfc.nasa.gov
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