The source of this material is the COMET® Website at http://meted.ucar.edu/ of the University Corporation for Atmospheric Research (UCAR), sponsored in part through cooperative agreement(s) with the National Oceanic and Atmospheric Administration (NOAA), U.S. Department of Commerce (DOC). ©1997-2009 University Corporation for Atmospheric Research. All Rights Reserved.

The composition of the thermosphere (atmosphere above 100 km height). Between 100 and 200 km molecular nitrogen and atomic oxygen are the most abundant. © UCAR, source: COMET® site.