gov.noaa.ngdc.stp.solar:G101111957Observing the Sun in the Calcium wavelengths provides scientists with information about the processes occurring at different altitudes in the solar atmosphere. For many years, solar observatories have monitored the Sun in the Calcium (Ca) K line wavelength by using a filter that allows only this wavelength's light through, producing calcium filtergrams or spectroheliograms. In the Ca K wavelength one sees bright areas or "plages" (a French word meaning beaches), occurring above sunspot regions. They are located in the chromosphere, at a higher altitude in the solar atmosphere than the sunspot regions in the photosphere. These hot plages or active regions move across the Sun and grow and decay along with the sunspot regions. Daily full disk Calcium K images are reduced to provide Calcium plage positions, areas and intensities or a daily index of the total area. NGDC archives solar Calcium images, reduced tabular data and daily indices.To provide long-term scientific data stewardship for the Nation's geophysical data, ensuring quality, integrity, and accessibility.1915UnknownUnknownIn workasNeededNASA/Global Change Master Directory (GCMD) Earth Science KeywordsEarth Science > Atmosphere > Atmospheric Radiation > Solar IrradianceEarth Science > Atmosphere > Atmospheric Radiation > Solar RadiationEarth Science > Sun-Earth Interactions > Ionosphere/Magnetosphere Dynamics > Solar WindEarth Science > Sun-Earth Interactions > Solar Activity > Solar Active RegionsEarth Science > Sun-Earth Interactions > Solar Activity > Solar ImageryEarth Science > Sun-Earth Interactions > Solar Activity > Solar IrradianceEarth Science > Sun-Earth Interactions > Solar Activity > Solar Prominences/Solar FilamentsEarth Science > Sun-Earth Interactions > Solar Activity > Solar Ultraviolet EmissionsNASA/GCMD Location KeywordsSpace > Solar Region > ChromosphereSpace > Solar Region > PhotosphereRestriction 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