2.3.2 spase://NASA/NumericalData/ICON/EUV/L2/PT1S ICON Extreme Ultraviolet Spectrograph Images EUV Images 2021-01-01T00:00:00Z This describes the data produce for ICON EUV Daytime O+ (DP 2.6), which is in NetCDF4 format. These files are named ICON_L2-6_EUV_YYYY-MM-DD_vXXrZZ.NC, where YYYY-MM-DD is the year month day and VXX shows the version number and rZZ shows the revision number of this file. Each individual file nominally contains 1 day (24 hours) of data. The L2 EUV Daytime files are produced from the L1 EUV files, and their primary data product is the O+ profile derived from a retrieval that is detailed in a paper: https://doi.org/10.1007/s11214-017-0385-1. In addition, many other parameters and geophysical data products are included in the file. The data are identified in one of 3 var_types: data – which contains the primary data product; support data – which contains parameters used in the retrieval such as geometry etc. that may also be useful in any analysis of this data; and ignore_data – which are recorded for debugging purposes and should not be used for publication without detailed discussion with the ICON team. The dimensions of the data also indicate its type. For example, anything with epoch as a dimension means there is 1 value corresponding to each instrument exposure. Anything with dimension Input_data corresponds to the input data, passed from Level 1. Anything with a dimension of model refers to the forward model parameters used as part of the inversion. Anything with dimension altitude corresponds to the altitude grid used for the inverted parameters. National Aeronautics and Space Administration; Dr. Jerry Edelstein National Aeronautics and Space Administration Explorers Program contracts NNG12FA45C spase://SMWG/Person/Jerry.Edelstein PrincipalInvestigator Additional information on ICON https://icon.ssl.berkeley.edu/ ICON spacecraft Homepage. Design and Performance of the ICON EUV Spectrograph https://doi.org/10.1007/s11214-017-0384-2 Space Science Reviews, 212(1-2), pp.631-643. DOI: 10.1007/s11214-017-0384-2 spase://SMWG/Repository/NASA/GSFC/SPDF Online Open HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/icon/l2/ Access to ICON data at the Space Physics Data Facility (SPDF) NetCDF Calibrated ICON EUV team spase://SMWG/Instrument/ICON/EUV ImageIntensity 2019-12-06T00:00:00Z -P2M PT1S Earth.NearSurface.Atmosphere Earth.NearSurface.Ionosphere Epoch Time Epoch Sample time, midpoint of exposure. Number of msec since Jan 1, 1970. PT1S ms 0 6000000000000 -999 Magnitude Temporal Activity Status of the EUV Instrument ICON_L26_Activity Flag for activity status of the EUV instrument, as defined in the Ephemeris Definition Document. PT1S 0 1024 -999 Scalar InstrumentMode Altitude of the Retrieved Quantities ICON_L26_Altitude Altitude corresponding to the retrieved quantities, in WGS84. PT1S km -999 Direction Positional Ap Index ICON_L26_Ap Value of the Ap index used in the retrieval, from GPI file. PT1S 0 400 -999 Scalar Magnetic Local Earth Radius at Retrieval ICON_L26_Earth_Radius Local Earth Radius at Retrieval location, from WGS. PT1S km 0 7000 -999 Scalar Other F10.7 Values ICON_L24_F107 F10.7 values used, from GPI file, in solar flux units. PT1S sfu 0 999 -999 Photon Scalar EnergyFlux F10.7a Values ICON_L24_F107a F10.7a values used, from GPI file, in solar flux units. PT1S sfu 0 999 -999 Photon Scalar EnergyFlux Retrieval Flags ICON_L26_Flags Quality flag associated with the retrieval and L1 data. PT1S -999 Scalar DataQuality Height of F2 layer from Retrieval ICON_L26_HmF2 Height of the peak of the F2 layer from Retrieval, in WGS. PT1S km 0 1000 -999 Scalar Positional Input Altitude ICON_L26_Input_Altitude *Diagnostic* Tangent altitudes corresponding to the input data, in WGS84. PT1S km 0 1000 -999 Direction Positional Input Covariance for 61.7 nm ICON_L26_Input_Covariance_617 *Diagnostic* Covariance of the observed Radiance in the 61.7 nm wavelength channel. PT1S Rayleighs^2 0 1000000015047466219876688855040 -999 Variance DataQuality Input Covariance for 83.4 nm ICON_L26_Input_Covariance_834 *Diagnostic* Covariance of the observed Radiance in the 83.4 nm wavelength channel. PT1S Rayleighs^2 0 1000000015047466219876688855040 -999 Variance DataQuality Input Filename ICON_L26_Input_Filename Name of the L1 file used with the input data. PT1S string Scalar Other Input Radiance 61.7 nm ICON_L26_Input_Radiance_617 *Diagnostic* Observed Radiance in the 61.7 nm wavelength channel. PT1S Rayleighs 0 1000000015047466219876688855040 -999 Photon Scalar Intensity Input Radiance 83.4 nm ICON_L26_Input_Radiance_834 *Diagnostic* Observed Radiance in the 83.4 nm wavelength channel. PT1S Rayleighs 0 1000000015047466219876688855040 -999 Photon Scalar Intensity Geodetic Latitude ICON_L26_Latitude Geodetic Latitude at retrieval location, referenced at 300 km altitude, in WGS. PT1S degrees -90 90 -999 Direction Positional Local Solar Time ICON_L26_Local_Solar_Time Local solar time at Retrieval. PT12S hours 0 24 -999 Direction Positional Geodetic Longitude ICON_L26_Longitude Geodetic Longitude at retrieval location, referenced at 300 km altitude in WGS. PT1S degrees 0 360 -999 Direction Positional Magnetic Latitude ICON_L26_Magnetic_Latitude Quasi-Dipole Magnetic Latitude at 300 km at Retrieval location, in degrees. PT1S degrees -90 90 -999 Direction Positional Magnetic Longitude ICON_L26_Magnetic_Longitude Quasi-Dipole Magnetic Longitude at 300 km at Retrieval location, in degrees. PT1S degrees -180 180 -999 Direction Positional Model Change ICON_L26_Model_Change '*Diagnostic* A value of 1 shows which forward model parameters are set to change during the retrieval, where the parameters are in order, Rz12 multiplier, ig12 multiplier, IRI F107 multiplier, density scalar, and the j0 multiplier'. PT1S unitless 0 999 -999 Scalar Other Model Covariance ICON_L26_Model_Covariance *Diagnostic* Covariance matrix of the model parameters from the retrieval. PT1S unitless 0 1000000015047466219876688855040 -999 Tensor Other Model Lower Limit ICON_L26_Model_Lower_Limit *Diagnostic* Lower limit of the parameters used in the forward model, which are in order, Rz12 multiplier, ig12 multiplier, IRI F107 multiplier, density scalar, and the j0 multiplier. PT1S unitless -1000 1000 -999 Fit Other Model Parameters ICON_L26_Model_Parameters *Diagnostic* Parameters used in the forwared model, which are in order, Rz12 multiplier, ig12 multiplier, IRI F107 multiplier, density scalar, and the j0 multiplier. PT1S unitless 0 999 -999 Fit Other Model Parameters Initial ICON_L26_Model_Parameters_Initial *Diagnostic* Initial values of the parameters used in the forward model, which are in order, Rz12 multiplier, ig12 multiplier, IRI F107 multiplier, density scalar, and the j0 multiplier. PT1S unitless 0 999 -999 Fit Other Model Upper Limit ICON_L26_Model_Upper_Limit *Diagnostic* Upper limit of the parameters used in the forward model, which are in order, Rz12 multiplier, ig12 multiplier, IRI F107 multiplier, density scalar, and the j0 multiplier. PT1S unitless 0 999 -999 Fit Other O+ density at the peak of the F2 layer from Retrieval ICON_L26_NmF2 O+ density at the peak of the F2 layer from Retrieval. PT1S 1/cm^3 0 10000000000 -999 Ion LineOfSight NumberDensity 8 WGS84 Altitude of s/c Position (Geodetic) ICON_L26_Observatory_Altitude Altitude of the spacecraft at the time of data collection, in WGS84. PT1S km 0 1000 -999 Direction Positional Earth Centered Earth Fixed Spacecraft Position ICON_L26_Observatory_ECEF Location of the spacecraft in ECEF coordinates at the time of data collection. Dimension corresponding to the X, Y, Z components of Cartesian vector. PT1S km Cartesian ECEF 3 2069 Spacecraft Position in ECEF Coordinates X 1 km 6000 10000 -999 Y 2 km 6000 10000 -999 Z 3 km 6000 10000 -999 Direction Positional WGS84 Latitude of Spacecraft Position (Geodetic) ICON_L26_Observatory_Latitude Geographic latitude of the spacecraft at the time of data collection, in WGS84. PT1S degrees -90 90 -999 Direction Positional WGS84 Latitude of Spacecraft Position (Geodetic) ICON_L26_Observatory_Longitude Geographic longitude of the spacecraft at the time of data collection, in WGS84. PT1S degrees 0 360 -999 Direction Positional Number density of O+ ICON_L26_Oplus Number density of O+ as a function of altitude found in the retrieval. PT1S 1/cm^3 -999 Ion LineOfSight NumberDensity 8 Orbit Number ICON_L26_Orbit_Number Integer orbit number of the ICON spacecraft, incremented throughout the mission. PT1S integer 0 105000 -999 Scalar Temporal Processing Date ICON_L26_Processing_Date Date on which this file was generated by the Science Data Center. PT1S string Scalar Other Radiance 61.7 nm ICON_L26_Radiance_617 Radiance profile of 61.7 nm emission produced by the forward model during the retrieval. PT1S Rayleighs 0 1000000015047466219876688855040 -999 Photon Scalar Intensity Radiance 83.4 nm ICON_L26_Radiance_834 Radiance profile of 83.4 nm emission produced by the forward model during the retrieval. PT1S Rayleighs 0 1000000015047466219876688855040 -999 Photon Scalar Intensity Retrieval Flags ICON_L26_SC_Slew_Status Flag corresponding to slew of the spacecraft during the time of data collection as defined in the ephemeris definition document. PT1S 0 1024 -999 Scalar InstrumentMode 1 sigma in Height of F2 layer from Retrieval ICON_L26_Sigma_HmF2 1 sigma in Height of F2 layer peak from retrieval. PT1S Rayleighs 0 1000 -999 Photon Scalar Intensity 1 sigma in Density of F2 layer from Retrieval ICON_L26_Sigma_NmF2 1 sigma in O+ density at the peak of the F2 layer from retrieval. PT1S cm-3 0 10000000000 -999 Ion LineOfSight NumberDensity 8 1 Sigma in the Number Density of O+ ICON_L26_Sigma_Oplus 1 sigma in the number density of O+ as a function of altitude found in the retrieval. PT1S cm-3 -999 Ion LineOfSight NumberDensity 8 Solar Zenith Angle at Retrieval Location ICON_L26_Solar_Zenith_Angle Solar Zenith Angle at retrieval location. PT12S degrees 0 180 -999 Direction Positional Space Environment Region Status ICON_L26_Space_Environment_Region_Status Flag corresponding to space environment region as defined in the ephemeris definition document during the time of data collection. PT1S 0 268405455 -999 Scalar Other Binary Coded Integer Describing the View Status of EUV ICON_L26_Status Flag for activity status of the spacecraft, as defined in the Ephemeris Definition Document. PT1S 0 1024 -999 Scalar InstrumentMode Spacecraft Sun/Shadow Status Code ICON_L26_Sun_Status Flag for activity status of the sun on the spacecraft, as defined in the Ephemeris Definition Document. 0=Sun 1=Earth Shadow. PT1S 0 1 -999 Scalar Other Date and Time in UTC format ICON_L26_UTC_Time UTC time corresponding to the retrieval. PT1S ' ' Magnitude Temporal UT Seconds ICON_L26_UT_Seconds UTC time in seconds since midnight corresponding to the time of the retrieval. PT1S seconds -999 Magnitude Temporal Unreduced Chi^2 ICON_L26_Unreduced_Chi2 Unreduced Chi Squared values from the retrieval. PT1S unitless -999 Scalar Other Integer Year DOY ICON_L26_Year_DOY Year and Day of Year corresponding to the retrieval, in the format of YYYYDOY. PT1S day 2015000 2050000 -999 Magnitude Temporal