This describes the Level 3.2 data product for ICON which is in NetCDF4 format. These files are named ICON_L3-2_YYYY-MM-DD_vXXrZZZ.NC,
where YYYY-MM-DD is the year month day, XX shows the version number and ZZZ shows the revision number of this file. Each individual file contains
one calendar day (24 hours) of data, merging data from the EUV and FUV Level 2 ionosphere products. The 12-second integration time is preserved
in all samples. For FUV, the central 4 of 6 imaging stripes are used to match the EUV 12-deg horizontal field of regard. All data are filtered to
remove flagged bad data (FUV Level 2.5 Data Quality = 0 in any of the 4 stripes, and EUV Level 2.6 Data Warning = 2). Consult the Level 2 data
files for more information. Altitude profiles are generated on a 5-km resolution altitude grid. FUV data in all 4 stripes are binned and averaged
using a weighted mean. EUV altitude profiles are interpolated onto the grid.

 Each data source has been evaluated for precision to meet the original ICON science goals and requirements, but may require systematic offsets or 
 scaling for accuracy in alternate applications, for details see:
   Nighttime (FUV) O+ validation : https://doi.org/10.1007/s11214-023-00970-2
   Daytime (EUV) O+ validation : https://doi.org/10.1007/s11214-022-00930-2"

Time corresponding to the center of each observation, in milliseconds since Jan 1 1970.

"UTC time corresponding to the measurement.

Geodetic Latitude.

Geodetic longitude at retrieval location, in WGS referenced to 300 km tangent point for daytime (EUV), and to HmF2 tangent point location for nighttime (FUV).

Altitude corresponding to the retrieved quantities, in WGS84 in 5 km increments, centered, e.g. 150 km means 147.5 km <= Altitude < 152.5 km.

Quasi-dipole magnetic latitude at retrieval location, referenced to 300 km tangent point for daytime (EUV), and to HmF2 tangent point location for nighttime (FUV) calculated using the fast implementation developed by Emmert et al. (2010, doi:10.1029/2010JA015326) and the Python wrapper apexpy (https://github.com/aburrell/apexpy/).

Quasi-dipole magnetic longitude at retrieval location, referenced to 300 km tangent point for daytime (EUV), and to HmF2 tangent point location for nighttime (FUV) calculated using the fast implementation developed by Emmert et al. (2010, doi:10.1029/2010JA015326) and the Python wrapper apexpy (https://github.com/aburrell/apexpy/).

Height of the peak electron density of the F2 layer from retrieval, in WGS.

1-sigma uncertainty in height of the F2 layer peak from retrieval, as determined from the reported statistical uncertainties and/or weighted averaging of the measurements.

Electron density at the peak of the F2 layer from retrieval.

1-sigma uncertainty in electron density at the peak of the F2 layer as determined from the reported statistical uncertainties and/or weighted averaging of the measurements.

Number density of O+ as a function of altitude.

1-sigma uncertainty in the number density of O+ as a function of altitude as determined from the reported statistical uncertainties and/or weighted averaging of the measurements.

Local Solar Time at retrieval location.

Solar Zenith Angle at retrieval location.

Data product contributing to each O+ measurement. Value: 2.5 is FUV nighttime ionosphere, 2.6 is EUV daytime ionosphere.