Data Access
GOES-18 EXIS/XRS science-quality Level 2 1-minute average X-ray irradiance (avg1m) product in daily NetCDF-4 files. The product provides one-minute averages of corrected primary-channel and individual-detector XRS-A (0.05-0.4 nm) and XRS-B (0.1-0.8 nm) fluxes, along with uncorrected observed fluxes and estimated electron contamination contributions. It includes the number of valid samples contributing to each average, quality flags and flags for excluded samples, primary channel information, corrected XRS-B2 quadrant currents, electron-correction status and spacecraft ancillary data. This science-quality Level 2 product is generated using retrospectively reprocessed data and updated calibrations and corrections, separately from the operational Level 2 series used for space-weather operations. NOAA recommends science-quality Level 2 XRS products for scientific analysis. Consult the XRS Level 2 ReadMe and User Guide for details.
Version:2.7.2
Version:2.7.2
GOES-18 EXIS/XRS science-quality Level 2 1-minute average X-ray irradiance (avg1m) product in daily NetCDF-4 files. The product provides one-minute averages of corrected primary-channel and individual-detector XRS-A (0.05-0.4 nm) and XRS-B (0.1-0.8 nm) fluxes, along with uncorrected observed fluxes and estimated electron contamination contributions. It includes the number of valid samples contributing to each average, quality flags and flags for excluded samples, primary channel information, corrected XRS-B2 quadrant currents, electron-correction status and spacecraft ancillary data. This science-quality Level 2 product is generated using retrospectively reprocessed data and updated calibrations and corrections, separately from the operational Level 2 series used for space-weather operations. NOAA recommends science-quality Level 2 XRS products for scientific analysis. Consult the XRS Level 2 ReadMe and User Guide for details.
| Role | Person | StartDate | StopDate | Note | |
|---|---|---|---|---|---|
| 1. | InstrumentScientist | spase://SMWG/Person/Janet.L.Machol | |||
| 2. | GeneralContact | spase://SMWG/Person/NOAA.GOES-R.EXIS |
Official NOAA dataset description, citation, access details and lineage.
NOAA product descriptions, operational/science processing differences, and data caveats.
User Guide describing the XRS Level 2 data processing algorithms, variable definitions, calibration corrections, and quality flags.
Daily science-quality GOES-18 XRS Level 2 1-minute average (avg1m) NetCDF files; browse by year and month.
One-minute average solar X-ray irradiance in the XRS-A band (0.05-0.4 nm), using the XRS-A primary-channel merged signal. Electron contamination estimated using GOES SEISS/MPS-HI has been subtracted: xrsa_flux = xrsa_flux_observed - xrsa_flux_electrons. The flux is at the spacecraft and has not been normalized to 1 AU; multiply by au_factor for the equivalent irradiance at 1 AU.
One-minute average observed XRS-A (0.05-0.4 nm) irradiance from XRS-A, before subtraction of estimated electron contamination. Reported in W/m^2 at the spacecraft, not normalized to 1 AU. The associated electron-equivalent component is xrsa_flux_electrons; the electron-corrected product is xrsa_flux.
Estimated electron contamination in the one-minute XRS-A (0.05-0.4 nm) irradiance from XRS-A, derived using GOES SEISS/MPS-HI electron measurements. This quantity is the apparent contribution to the XRS irradiance in W/m^2, not the electron particle flux. Subtract it from xrsa_flux_observed to obtain xrsa_flux; see electron_correction_flag for correction quality and significance.
One-minute average solar X-ray irradiance in the XRS-B band (0.1-0.8 nm), using the XRS-B primary-channel merged signal. Electron contamination estimated using GOES SEISS/MPS-HI has been subtracted: xrsb_flux = xrsb_flux_observed - xrsb_flux_electrons. The flux is at the spacecraft and has not been normalized to 1 AU; multiply by au_factor for the equivalent irradiance at 1 AU.
One-minute average observed XRS-B (0.1-0.8 nm) irradiance from XRS-B, before subtraction of estimated electron contamination. Reported in W/m^2 at the spacecraft, not normalized to 1 AU. The associated electron-equivalent component is xrsb_flux_electrons; the electron-corrected product is xrsb_flux.
Estimated electron contamination in the one-minute XRS-B (0.1-0.8 nm) irradiance from XRS-B, derived using GOES SEISS/MPS-HI electron measurements. This quantity is the apparent contribution to the XRS irradiance in W/m^2, not the electron particle flux. Subtract it from xrsb_flux_observed to obtain xrsb_flux; see electron_correction_flag for correction quality and significance.
Quality/status flag for the one-minute xrsa average. A value of 0 indicates good data; flag values 1, 2, and 4 indicate eclipse, bad data, and interpolated data, respectively. Flags may be combined as bit fields. Interpret combinations using NetCDF flag_masks, flag_values, and flag_meanings.
Quality/status flag for the one-minute xrsb average. A value of 0 indicates good data; flag values 1, 2, and 4 indicate eclipse, bad data, and interpolated data, respectively. Flags may be combined as bit fields. Interpret combinations using NetCDF flag_masks, flag_values, and flag_meanings.
Number of individual measurements contributing to the one-minute xrsa_flux average; useful for assessing sample coverage within each averaging interval.
Number of individual measurements contributing to the one-minute xrsb_flux average; useful for assessing sample coverage within each averaging interval.
Start time of each one-minute average, in seconds since 2000-01-01 12:00:00 UTC, neglecting leap seconds.
Bitwise union of data-quality conditions on samples excluded from the one-minute xrsa_flux average. Possible conditions include eclipse, particle spike, calibration, off-pointing, temperature and data-quality errors, invalid mode, missing data, and Level 0 error. Consult NetCDF flag_masks and flag_meanings.
Bitwise union of data-quality conditions on samples excluded from the one-minute xrsb_flux average. Possible conditions include eclipse, particle spike, calibration, off-pointing, temperature and data-quality errors, invalid mode, missing data, and Level 0 error. Consult NetCDF flag_masks and flag_meanings.
Dimensionless multiplicative factor used to convert solar X-ray irradiance measured at the GOES spacecraft to equivalent irradiance at 1 AU: F_1AU = F_spacecraft × au_factor. The reported XRS flux variables are not already normalized to 1 AU. The factor varies seasonally with the Sun-spacecraft distance (typically about 0.967-1.034 near Earth orbit).
Corrected electric currents from the four quadrants of the XRS-B2 photodiode, provided in amperes (A). This is a detector-current diagnostic, not solar irradiance or electron particle flux.
Angular offset of the spacecraft solar-pointing reference relative to the celestial north rotational pole, measured counterclockwise in degrees. When Level 1b roll information is unavailable, the product uses 180 degrees for normal orientation or 0 degrees for yaw-flipped orientation.
One-minute average solar X-ray irradiance in the XRS-A band (0.05-0.4 nm), using the XRS-A1 individual-detector signal. Electron contamination estimated using GOES SEISS/MPS-HI has been subtracted: xrsa1_flux = xrsa1_flux_observed - xrsa1_flux_electrons. The flux is at the spacecraft and has not been normalized to 1 AU; multiply by au_factor for the equivalent irradiance at 1 AU.
One-minute average observed XRS-A (0.05-0.4 nm) irradiance from XRS-A1, before subtraction of estimated electron contamination. Reported in W/m^2 at the spacecraft, not normalized to 1 AU. The associated electron-equivalent component is xrsa1_flux_electrons; the electron-corrected product is xrsa1_flux.
Estimated electron contamination in the one-minute XRS-A (0.05-0.4 nm) irradiance from XRS-A1, derived using GOES SEISS/MPS-HI electron measurements. This quantity is the apparent contribution to the XRS irradiance in W/m^2, not the electron particle flux. Subtract it from xrsa1_flux_observed to obtain xrsa1_flux; see electron_correction_flag for correction quality and significance.
One-minute average solar X-ray irradiance in the XRS-A band (0.05-0.4 nm), using the XRS-A2 individual-detector signal. Electron contamination estimated using GOES SEISS/MPS-HI has been subtracted: xrsa2_flux = xrsa2_flux_observed - xrsa2_flux_electrons. The flux is at the spacecraft and has not been normalized to 1 AU; multiply by au_factor for the equivalent irradiance at 1 AU.
One-minute average observed XRS-A (0.05-0.4 nm) irradiance from XRS-A2, before subtraction of estimated electron contamination. Reported in W/m^2 at the spacecraft, not normalized to 1 AU. The associated electron-equivalent component is xrsa2_flux_electrons; the electron-corrected product is xrsa2_flux.
Estimated electron contamination in the one-minute XRS-A (0.05-0.4 nm) irradiance from XRS-A2, derived using GOES SEISS/MPS-HI electron measurements. This quantity is the apparent contribution to the XRS irradiance in W/m^2, not the electron particle flux. Subtract it from xrsa2_flux_observed to obtain xrsa2_flux; see electron_correction_flag for correction quality and significance.
One-minute average solar X-ray irradiance in the XRS-B band (0.1-0.8 nm), using the XRS-B1 individual-detector signal. Electron contamination estimated using GOES SEISS/MPS-HI has been subtracted: xrsb1_flux = xrsb1_flux_observed - xrsb1_flux_electrons. The flux is at the spacecraft and has not been normalized to 1 AU; multiply by au_factor for the equivalent irradiance at 1 AU.
One-minute average observed XRS-B (0.1-0.8 nm) irradiance from XRS-B1, before subtraction of estimated electron contamination. Reported in W/m^2 at the spacecraft, not normalized to 1 AU. The associated electron-equivalent component is xrsb1_flux_electrons; the electron-corrected product is xrsb1_flux.
Estimated electron contamination in the one-minute XRS-B (0.1-0.8 nm) irradiance from XRS-B1, derived using GOES SEISS/MPS-HI electron measurements. This quantity is the apparent contribution to the XRS irradiance in W/m^2, not the electron particle flux. Subtract it from xrsb1_flux_observed to obtain xrsb1_flux; see electron_correction_flag for correction quality and significance.
One-minute average solar X-ray irradiance in the XRS-B band (0.1-0.8 nm), using the XRS-B2 individual-detector signal. Electron contamination estimated using GOES SEISS/MPS-HI has been subtracted: xrsb2_flux = xrsb2_flux_observed - xrsb2_flux_electrons. The flux is at the spacecraft and has not been normalized to 1 AU; multiply by au_factor for the equivalent irradiance at 1 AU.
One-minute average observed XRS-B (0.1-0.8 nm) irradiance from XRS-B2, before subtraction of estimated electron contamination. Reported in W/m^2 at the spacecraft, not normalized to 1 AU. The associated electron-equivalent component is xrsb2_flux_electrons; the electron-corrected product is xrsb2_flux.
Estimated electron contamination in the one-minute XRS-B (0.1-0.8 nm) irradiance from XRS-B2, derived using GOES SEISS/MPS-HI electron measurements. This quantity is the apparent contribution to the XRS irradiance in W/m^2, not the electron particle flux. Subtract it from xrsb2_flux_observed to obtain xrsb2_flux; see electron_correction_flag for correction quality and significance.
Bit-field identifying the primary XRS detectors used in the one-minute averages. For XRS-A, bit-mask values 1, 2, and 3 indicate A1, A2, and both; for XRS-B, values 4, 8, and 12 indicate B1, B2, and both. Both detectors can contribute within an averaging interval; refer to NetCDF flag_masks and flag_meanings.
Quality/status flag for the one-minute xrsa1 average. A value of 0 indicates good data; flag values 1, 2, and 4 indicate eclipse, bad data, and interpolated data, respectively. Flags may be combined as bit fields. Interpret combinations using NetCDF flag_masks, flag_values, and flag_meanings.
Quality/status flag for the one-minute xrsa2 average. A value of 0 indicates good data; flag values 1, 2, and 4 indicate eclipse, bad data, and interpolated data, respectively. Flags may be combined as bit fields. Interpret combinations using NetCDF flag_masks, flag_values, and flag_meanings.
Quality/status flag for the one-minute xrsb1 average. A value of 0 indicates good data; flag values 1, 2, and 4 indicate eclipse, bad data, and interpolated data, respectively. Flags may be combined as bit fields. Interpret combinations using NetCDF flag_masks, flag_values, and flag_meanings.
Quality/status flag for the one-minute xrsb2 average. A value of 0 indicates good data; flag values 1, 2, and 4 indicate eclipse, bad data, and interpolated data, respectively. Flags may be combined as bit fields. Interpret combinations using NetCDF flag_masks, flag_values, and flag_meanings.
Number of individual measurements contributing to the one-minute xrsa1_flux average; useful for assessing sample coverage within each averaging interval.
Number of individual measurements contributing to the one-minute xrsa2_flux average; useful for assessing sample coverage within each averaging interval.
Number of individual measurements contributing to the one-minute xrsb1_flux average; useful for assessing sample coverage within each averaging interval.
Number of individual measurements contributing to the one-minute xrsb2_flux average; useful for assessing sample coverage within each averaging interval.
Bitwise union of data-quality conditions on samples excluded from the one-minute xrsa1_flux average. Possible conditions include eclipse, particle spike, calibration, off-pointing, temperature and data-quality errors, invalid mode, missing data, and Level 0 error. Consult NetCDF flag_masks and flag_meanings.
Bitwise union of data-quality conditions on samples excluded from the one-minute xrsa2_flux average. Possible conditions include eclipse, particle spike, calibration, off-pointing, temperature and data-quality errors, invalid mode, missing data, and Level 0 error. Consult NetCDF flag_masks and flag_meanings.
Bitwise union of data-quality conditions on samples excluded from the one-minute xrsb1_flux average. Possible conditions include eclipse, particle spike, calibration, off-pointing, temperature and data-quality errors, invalid mode, missing data, and Level 0 error. Consult NetCDF flag_masks and flag_meanings.
Bitwise union of data-quality conditions on samples excluded from the one-minute xrsb2_flux average. Possible conditions include eclipse, particle spike, calibration, off-pointing, temperature and data-quality errors, invalid mode, missing data, and Level 0 error. Consult NetCDF flag_masks and flag_meanings.
Spacecraft yaw-orientation state: upright (0), neither/transition (1), or inverted (2). During a yaw flip the flag may be 1 or the fill value; consult NetCDF flag_meanings.
Bit-field status of the GOES SEISS/MPS-HI-based electron contamination correction. The electron correction is valid when its status bit indicates 0 and invalid when the invalid-status bit is set (value 1). The interpolation flag (value 2) indicates short gaps in SEISS/MPS-HI data. The decay flag (value 4) indicates the correction is smoothly turned off over approximately 2 hours when SEISS/MPS-HI data are missing and a future value is unavailable; the correction is marked invalid after 1 hour of decay. Channel-specific significance flags (values 8, 16, 32, 64, 128, and 256 for XRS-A, XRS-B, A1, A2, B1, and B2, respectively) indicate that the estimated electron contamination exceeds 50% of the observed signal. Interpret combined flags using NetCDF flag_masks, flag_values, and flag_meanings.