gov.noaa.ngdc.stp.solar:G006031972Airglow is a faint luminescence of the earth's upper atmosphere. The emitted electromagnetic radiation results mainly from photo-chemical reactions of upper atmospheric constituents. Although ionic recombination and bombardment by energetic particles are other mechanisms that can cause airglow, the main emissions include the atomic oxygen forbidden green line (5577A) and forbidden red line (6300A), the sodium doublet (5890A and 5896A), and the hydroxyl (OH) band system. This airglow is produced in a 10 to 20 km thick zone at an altitude of about 100 km. This airglow can be seen by the naked eye on a dark night away from city lights.Earth-Upper Atmosphere Research19720101UnknownUnknownIn workmonthlyNASA/Global Change Master Directory (GCMD) Earth Science KeywordsEARTH SCIENCE > Sun-earth Interactions > Ionosphere/Magnetosphere Particles > Energy DepositionEARTH SCIENCE > Sun-earth Interactions > Ionosphere/Magnetosphere Particles > Energetic ParticlesUncontrolled KeywordsAirglowEnergetic particlesAtmosphereElectromagneticRadiationPhotochemicalNASA/GCMD Location KeywordsIonosphereRestriction Code: otherRestrictions; DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of CommerceSolar Data Managerphysical and mailing NOAA/NESDIS/NGDC E/GC2 325 Broadway BoulderCO80305303.497.6133 or 303.497.6323solar.ngdc@noaa.govUnknown 20111117Solar Data ManagerDOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commercemailing and physical NOAA/NESDIS/NGDC E/GC2 325 Broadway BoulderCO80305303.497.6133 or 303.497.6323solar.ngdc@noaa.govContent Standard for Digital Geospatial Metadata: Extensions for Remote Sensing MetadataFGDC-STD-012-2002