# GOME_L1_EXTRACTED_sun_reference

## Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of `GOME_L1_EXTRACTED_sun_reference` data.

field name | type | dimensions | unit | description
--- | --- | --- | --- | ---
datetime | double | {time} | [seconds since 2000-01-01] | time of the sun reference measurement at the end of the integration time
orbit_index | int32 |  |  | absolute orbit number
wavelength_photon_irradiance | double | {time, spectral} | [count/s/cm2/nm] | sun spectrum spectral irradiance
wavelength_photon_irradiance_uncertainty | double | {time, spectral} | [count/s/cm2/nm] | relative radiometric precision of the sun reference spectrum
wavelength | double | {time, spectral} | [nm] | nominal wavelength assignment for each of the detector pixels
index | int32 | {time} |  | zero-based index of the sample within the source product

## Ingestion options

The table below lists the available ingestion options for `GOME_L1_EXTRACTED` products.

option name | legal values | description
--- | --- | ---
band | band-1a, band-1b, band-2a, band-2b, band-3, band-4, blind-1a, straylight-1a, straylight-1b, straylight-2a | only include data from the specified band (‘band-1a’, ‘band-1b’, ‘band-2a’, ‘band-2b’, ‘band-3’, ‘band-4’, ‘blind-1a’, ‘straylight-1a’, ‘straylight-1b’, ‘straylight-2a’); by default data from all bands is retrieved
data | sun_reference | retrieve the measured radiances (default) or the sun spectra (data=sun_reference)

This definition is only applicable when: data=sun_reference

## Mapping description

GOME Level 1 Extracted Spectra Sun Reference

The table below details where and how each variable was retrieved from the input product.

field name | mapping description
--- | ---
datetime | path | /sfs/utc_solar_spectrum
orbit_index | path | /pir/start_orbit
wavelength_photon_irradiance | path | /cdr[]/sdr[]/abs_irr
wavelength_photon_irradiance_uncertainty | path | /cdr[]/sdr[]/abs_irr_err
wavelength | path | /cdr[]/sdr[]/wavelength