GOMOS

Global Ozone Monitoring by Occultation of Stars

Satellite

Envisat

Status

Operational – Utilised in the period 2002 to ~ 2013

Mission

Profiles of ozone and other species. Tracked species: O3, H2O, NO2, NO3, OClO, BrO, ClO and aerosol

Instrument type

UV/VIS/NIR grating spectrometer, three bands, ~ 1000 channels, two broadband channels for scintillations

Scanning technique

Limb sounding during occultation of 25-40 stars/orbit, i.e. average 500 occultations/day

Coverage/cycle

One global coverage/day with one measurement every 1000 x 1000 km2 cell in average

Resolution

Vertical: 1.7 km, in the altitude range 20-100 km. Horizontal effective resolution: ~ 300 km (limb geometry)

Resources

Mass: 163 kg - Power: 146 W - Data rate: 222 kbps

Spectral range

Number of channels

Spectral resolution

SNR at specified input radiance

248 - 693 nm

~ 500

0.89 nm

12 @ …............

750 - 776 nm

~ 200

0.12 nm

6 @ …..........

915 - 956 nm

~ 300

0.12 nm

3 @ …..........

466 - 705 nm

2

466-582 nm, 644-705 nm

15 @ …….……