Definition of upper atmosphere
51 U.S.C. § 20162
in effectIn this subchapter, the term “upper atmosphere” means that portion of the Earth’s sensible atmosphere above the troposphere.
Source: OLRC USLMURL: https://uscode.house.gov/download/releasepoints/us/pl/119/95/xml_usc51@119-95.zipFetched: 6/7/2026
