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CAL Computer Aided Learning
CALIPSO Cloud-Aerosol Lidar and Infrared Pathfinder Satellite (NASA/CNES)
CART Cloud and Radiation Test-bed
CAS Commission for Atmospheric Sciences (WMO)
CboM Commonwealth Bureau of Meteorology Australia
CBS Commission for Basic Systems
CCD Charged Couple Device (INSAT-2E)
CCIR Consultative Committee on International Radio
CCRI Climate Change Research Initiative
CCSDS Consultative Committee on Space Data Systems
CD Compact Disc
CDAS Command and Data Acquisition Station
CDMA Code Division Multiple Access
CDS Climate Data Set (EUMETSAT)
CEOS Committee on Earth Observation Satellites
CEPT Conference Européenne des Postes et Télécommunications/European Conference of Postal and Telecommunications Administrations
Cg WMO Congress
CGMS Coordination Group for Meteorological Satellites
CHAMP German EO Satellite
CHRIS Compact High Resolution Imaging Spectrometer (PROBA, ESA)
CHRPT Chinese HRPT (FY-1C and D)
CI Convective Initiation (NOAA)
CIIS Common Instrument Interface Studies
CIMS GOES Channel Interference Monitoring System
CIMSS Cooperative Institute of Meteorological Satellite Studies, Univ. Wisconsin
CIS Commonwealth of Independent States
CITEL Inter-American Telecommunication Commission
CLARE Cloud Lidar And Radar Experiment
CLASS Comprehensive Large-Array Stewardship System (NOAA)
CloudSat Global cloud property measuring satellite (NASA/CSA)
CLS Collecte Localisation Satellites (Toulouse)
CM WMO Consultative Meetings on High-Level Policy on Satellite Matters
CMA China Meteorological Administration
CMD Cyclone Warning Dissemination Service
CME Coronal Mass Ejections
CMIS Conical Scanning Microwave Imager/Sounder
CM-SAF Satellite Application Facility on Climate Monitoring (EUMETSAT)
CMP Climate Monitoring Principles (GCOS)
CMS Centre de Météorologie Spatiale (Lannion)
CMV Cloud Motion Vector
CMW Cloud Motion Wind
CNR Consiglio Nazionale delle Ricerche (Italy)
CNSA China National Space Administration
COCTS 10-band Chinese Ocean Colour and Temperature Scanner
COEs Centres of Excellence (WMO)
COMS Communication, Ocean and Meteorological Satellite (KMA)
CONAE Comisión Nacional de Actividades Espaciales (Argentina)
COOP Coastal Oceans Observations Panel (GOOS)
COP Conference of the Parties (GCOS)
COSPAR Committee on Space Research
COSPAS/ SARSAT International satellite system for search and rescue (SAR)
CPM Conference Preparatory Meeting (WRC)
CR CGMS Consolidated Report
CrIS Cross track Infrared Sounder
CRYOSAT Polar Ice Monitoring Programme (ESA)
CZI 4-band Coastal Zone Imager (HY-1B)