2.7.2 https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions spase://NOAA/NumericalData/GOES/18/EXIS/XRS/Science/L2/PT1S NOAA NumericalData GOES-18 EXIS/XRS Science Level 2 1-second X-ray Irradiance GOES-18 XRS L2 Science-Quality 1-second Fluxes (flx1s) 2026-10-20T00:08:46Z 2026-10-20T00:08:46Z Initial metadata creation. SY 2026-10-22T00:08:46Z Updated StartDate, ResourceHeader Description, and User Guide description. SY GOES-18 EXIS/XRS science-quality Level 2 one-second irradiance (flx1s) product distributed in daily NetCDF-4 files. The product provides irradiance in the XRS-A (0.05–0.4 nm) and XRS-B (0.1–0.8 nm) bands from individual low- and high-irradiance sensors, as well as primary-channel merged irradiance values for each band. The processing also includes quality/status flags, corrected quadrant currents, and spacecraft/instrument ancillary information. Electron contamination correction is not applied to the 1-second irradiance data; this correction is available in the 1-minute average Level 2 product. This science-quality Level 2 stream is generated using retrospectively reprocessed data and updated calibrations and corrections; it is distributed separately from the operational Level 2 series used for real-time space-weather operations. NOAA recommends the science-quality XRS Level 2 series for scientific analysis; consult the XRS L2 ReadMe and User Guide for details. Machol, Janet; Codrescu, Stefan; Viereck, Rodney 2018-09-01T00:00:00Z NOAA National Centers for Environmental Information spase://SMWG/Person/Janet.L.Machol InstrumentScientist NOAA NCEI Instrument Scientist and scientific contact for GOES-R EXIS/XRS. spase://SMWG/Person/NOAA.GOES-R.EXIS GeneralContact NOAA GOES-R EXIS Team NOAA NCEI GOES-R EXIS Level 2 Dataset Metadata https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=gov.noaa.ncei.swx%3Aexis-l2-goesr Official NOAA dataset description, citation, access details and lineage. NOAA GOES-R XRS Level 2 Data ReadMe https://data.ngdc.noaa.gov/platforms/solar-space-observing-satellites/goes/goes16/l2/docs/GOES-R_XRS_L2_Data_ReadMe.pdf NOAA product descriptions, operational/science processing differences, and data caveats. NOAA GOES-R XRS Level 2 Data User Guide https://data.ngdc.noaa.gov/platforms/solar-space-observing-satellites/goes/goes16/l2/docs/GOES-R_XRS_L2_Data_Users_Guide.pdf The User Guide describes the algorithms, parameters, time conventions, and interpretation of the XRS Level 2 products. spase://SMWG/Repository/NOAA/NCEI Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal NOAA-produced data are publicly available under NOAA's open data policy. Users should cite the NOAA NCEI dataset as specified in the dataset metadata. NOAA NCEI GOES-18 EXIS/XRS Science-Quality Level 2 1-second NetCDF Archive https://data.ngdc.noaa.gov/platforms/solar-space-observing-satellites/goes/goes18/l2/data/xrsf-l2-flx1s_science/ Daily science-quality GOES-18 XRS Level 2 1-second (flx1s) NetCDF files; browse by year and month. NetCDF None Geostationary Operational Environmental Satellite, R-Series (GOES-R) Extreme Ultraviolet X-Ray Irradiance Sensors (EXIS) Level 2 Products Science-Quality Level 2 spase://NOAA/Instrument/GOES/18/EXIS/XRS Irradiance 2022-06-07T00:00:00Z -P1D PT1S Sun Sun.Corona Time time Record start time of each 1-second XRS L2 sample, expressed as seconds since 2000-01-01 12:00:00 UTC, neglecting leap seconds. PT1S s -9999 Temporal XRS-A Primary Irradiance xrsa_flux One-second solar X-ray irradiance in the XRS-A band (0.05-0.4 nm), selected from the primary detector according to the xrsa_primary_chan indicator. This is the merged primary-channel irradiance. PT1S W/m^2 -9999 Photon EnergyFlux 0.05 0.4 nm XRS-A1 Irradiance xrsa1_flux One-second solar X-ray irradiance from the XRS-A1 low-irradiance high-sensitivity single photodiode. PT1S W/m^2 -9999 Photon EnergyFlux 0.05 0.4 nm XRS-A2 Irradiance xrsa2_flux One-second solar X-ray irradiance from the XRS-A2 high-irradiance lower-sensitivity quadrant photodiode. PT1S W/m^2 -9999 Photon EnergyFlux 0.05 0.4 nm XRS-A Primary Channel Selection xrsa_primary_chan Primary detector choice for XRS-A: 1 indicates detector A1, 2 indicates detector A2, and 255 indicates unknown. Refer to NetCDF flag_values and flag_meanings. PT1S 255 Other XRS-B Primary Irradiance xrsb_flux One-second solar X-ray irradiance in the XRS-B band (0.1-0.8 nm), selected from the primary detector according to the xrsb_primary_chan indicator. This is the merged primary-channel irradiance. PT1S W/m^2 -9999 Photon EnergyFlux 0.1 0.8 nm XRS-B1 Irradiance xrsb1_flux One-second solar X-ray irradiance from the XRS-B1 low-irradiance high-sensitivity single photodiode. PT1S W/m^2 -9999 Photon EnergyFlux 0.1 0.8 nm XRS-B2 Irradiance xrsb2_flux One-second solar X-ray irradiance from the XRS-B2 high-irradiance lower-sensitivity quadrant photodiode. PT1S W/m^2 -9999 Photon EnergyFlux 0.1 0.8 nm XRS-B Primary Channel Selection xrsb_primary_chan Primary detector choice for XRS-B: 1 indicates detector B1, 2 indicates detector B2, and 255 indicates unknown. Refer to NetCDF flag_values and flag_meanings. PT1S 255 Other XRS-A Flux Quality Flags xrsa_flags Bit-field quality flags for xrsa_flux. Interpret flags using NetCDF flag_masks, flag_values, and flag_meanings; a value of 0 indicates good data. PT1S 65535 DataQuality XRS-A1 Flux Quality Flags xrsa1_flags Bit-field quality flags for xrsa1_flux. Interpret flags using NetCDF flag_masks, flag_values, and flag_meanings; a value of 0 indicates good data. PT1S 65535 DataQuality XRS-A2 Flux Quality Flags xrsa2_flags Bit-field quality flags for xrsa2_flux. Interpret flags using NetCDF flag_masks, flag_values, and flag_meanings; a value of 0 indicates good data. PT1S 65535 DataQuality XRS-B Flux Quality Flags xrsb_flags Bit-field quality flags for xrsb_flux. Interpret flags using NetCDF flag_masks, flag_values, and flag_meanings; a value of 0 indicates good data. PT1S 65535 DataQuality XRS-B1 Flux Quality Flags xrsb1_flags Bit-field quality flags for xrsb1_flux. Interpret flags using NetCDF flag_masks, flag_values, and flag_meanings; a value of 0 indicates good data. PT1S 65535 DataQuality XRS-B2 Flux Quality Flags xrsb2_flags Bit-field quality flags for xrsb2_flux. Interpret flags using NetCDF flag_masks, flag_values, and flag_meanings; a value of 0 indicates good data. PT1S 65535 DataQuality XRS-A2 Corrected Quadrant Currents corrected_current_xrsa2 Corrected electric currents of four quadrants of the XRS-A2 detector, stored as a two-dimensional NetCDF variable indexed by time and quadrant. PT1S A -9999 Other XRS-B2 Corrected Quadrant Currents corrected_current_xrsb2 Corrected electric currents of four quadrants of the XRS-B2 detector, stored as a two-dimensional NetCDF variable indexed by time and quadrant. PT1S A -9999 Other 1-AU Distance Correction Factor au_factor Factor used for conversion of measured solar X-ray flux to the reference distance of 1 AU. Consult the product documentation for the correction convention. PT1S -9999 Other Spacecraft Roll Angle roll_angle Angular offset of the solar position pointing reference relative to the celestial north rotational pole, measured counterclockwise. PT1S degrees -9999 Other Spacecraft Yaw Flip Flag yaw_flip_flag Spacecraft orientation indicator with NetCDF flag meanings upright (0), neither (1), and inverted (2). PT1S 255 Other