gov.noaa.ngdc.stp.solar:G00542DOC/NOAA > National Oceanic & Atmospheric Administration1978The ultraviolet (UV) part of the electromagnetic spectrum ranges between 5 and 400 nanometers (nm). As the SORCE (Solar Radiation and Climate Experiment satellite) mission states, far UV irradiance from the Sun varies by as much as 10 percent during the Sun's 27-day rotation, while the bright 121.6 nm hydrogen Lyman-alpha emission may vary by as much as a factor of 2 during an 11-year solar cycle, dramatically affecting the energy input into the Earth's atmosphere. Water vapor and ozone are especially sensitive to changes in the solar UV radiation. Different wavelengths of solar radiation are absorbed at different altitudes in the Earth's atmosphere, affecting different physical processes. As Dr. Jack Eddy notes, we utterly depend on solar radiation. Long term monitoring of its variations over all wavelengths is critical to our understanding of the impacts on our environment.Solar Ultraviolet Research19781101UnknownUnknownIn workcontinualNASA/Global Change Master Directory (GCMD) Earth Science KeywordsEarth Science > Sun-Earth Interactions > Solar Activity > Solar Active RegionsEarth Science > Sun-Earth Interactions > Solar Activity > Solar Ultraviolet EmissionsEarth Science > Sun-Earth Interactions > Solar Activity > Solar X-Ray EmissionsUncontrolled KeywordsSolar PhysicsNASA/GCMD Location KeywordsGlobalRestriction 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