# Sentinel-4 UVN sounder
*sensor . products*

Ultraviolet, visible and near-infrared spectrometer hosted on MTG-S1 for hourly geostationary air-quality observations over Europe and northern Africa.

## Specifications
- **product status**: in-development
- **deployment context**: orbital
- **manufacturer**: esa
- **sensor**: {"instrument_family":"passive-optical","measurement_principle":"passive","spectral_range_nm":{"min":305,"max":775},"spectral_band_count":1500,"gsd_m":{"native":8000},"channels":[{"name":"UV","spectral_range_nm":{"min":305,"max":400},"spectral_band_count":600,"sampling_nm":0.5},{"name":"VIS","spectral_range_nm":{"min":400,"max":500},"spectral_band_count":600,"sampling_nm":0.5},{"name":"NIR","spectral_range_nm":{"min":755,"max":775},"spectral_band_count":300,"sampling_nm":0.2}]}
- **entity type**: sensor
- **last verified date**: 2026-06-16
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: esa
- **attributes**: {"kind":"sensor","product_status":"in-development","deployment_context":"orbital","manufacturer":"esa","description":"Ultraviolet, visible and near-infrared spectrometer hosted on MTG-S1 for hourly geostationary air-quality observations over Europe and northern Africa.","sensor":"{\"instrument_family\":\"passive-optical\",\"measurement_principle\":\"passive\",\"spectral_range_nm\":{\"min\":305,\"max\":775},\"spectral_band_count\":1500,\"gsd_m\":{\"native\":8000},\"channels\":[{\"name\":\"UV\",\"spectral_range_nm\":{\"min\":305,\"max\":400},\"spectral_band_count\":600,\"sampling_nm\":0.5},{\"name\":\"VIS\",\"spectral_range_nm\":{\"min\":400,\"max\":500},\"spectral_band_count\":600,\"sampling_nm\":0.5},{\"name\":\"NIR\",\"spectral_range_nm\":{\"min\":755,\"max\":775},\"spectral_band_count\":300,\"sampling_nm\":0.2}]}"}
- **relevance**: in-scope

## Editorial
Sentinel-4 UVN is a passive optical ultraviolet, visible and near-infrared imaging spectrometer hosted on Meteosat Third Generation Sounder satellites for geostationary atmospheric-composition observation. [^eumetsat-sentinel-4] [^esa-s4-spectrometer] Its spectral set covers UV 305-400 nm, visible 400-500 nm and near-infrared 755-775 nm, with 600 UV channels, 600 visible channels and 300 near-infrared channels. [^wmo-sentinel-4] Spatial sampling is about 8 km over the reference area. [^eumetsat-sentinel-4] The observing concept provides hourly daytime coverage over Europe and part of North Africa for air-quality trace gases and aerosols, including ozone, nitrogen dioxide and sulphur dioxide. [^eumetsat-sentinel-4] [^esa-s4-spectrometer] Sentinel-4 has demonstrated preliminary nitrogen dioxide, sulphur dioxide, ozone and radiance imaging on MTG-S1; those products came from 8 October 2025 scenes and were labelled illustrative rather than operational. [^eumetsat-s4-first-images] Those October 2025 scenes support first-data maturity, not routine operational service.

## Compositional position
- mtg-s1 (missions) --[mission_payloads]--> Sentinel-4 UVN sounder

## Sources
- [eumetsat-sentinel-4] | Copernicus Sentinel-4, EUMETSAT | https://www.eumetsat.int/sentinel-4 | tier=agency-doc | accessed=2026-06-16
- [esa-s4-spectrometer] | Sentinel-4 spectrometer, ESA | https://www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-4/Sentinel-4_spectrometer | tier=agency-doc | accessed=2026-06-16
- [wmo-sentinel-4] | WMO OSCAR instrument record: Sentinel-4 | https://space.oscar.wmo.int/instruments/view/sentinel_4 | tier=agency-doc | accessed=2026-06-16
- [eumetsat-s4-first-images] | First Copernicus Sentinel-4 images showcase Europe's hourly air pollution watch, EUMETSAT | https://www.eumetsat.int/first-copernicus-sentinel-4-images-showcase-europes-hourly-air-pollution-watch | tier=agency-doc | accessed=2026-06-16

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Source: https://eo-atlas.org/products/sensor/sentinel-4
Maintainer: SpectraWorks B.V. (CC-BY 4.0)