Full Name Microwave Imaging Radiometer using Aperture Synthesis (MIRAS) Status Operational
Instrument Agencies ESA, CNES Maturity
Instrument Type Imaging multi-spectral radiometers (passive microwave) and Multiple direction/polarisation radiometers Geometry Side-looking
Instrument Technology Multi-purpose imaging MW radiometer Sampling Imaging
Data Access Open Access Data Format
Measurements and Applications Objective is to meassure sea surface salinity and soil moisture in support of climate, meteorology, hydrology, and oceanography applications. New applications include Soil freeze/thaw, ocean severe winds, sea ice thickness, vegetation optical depth and solar flux.
Resolution Summary 33 - 50 km depending on the position in the swath - resampled to 15 km grid
[Best Resolution: 5000m]
Swath Summary Hexagon shape, nominal width 1050 km allowing a 3 day revisit time at the equator
Accuracy Summary 2.6 K absolute accuracy, RMS 1.6-4 K depending on the scene and the position within the swath
Waveband Summary L-Band 1.41 GHz
MW (~0.1 cm - ~100 cm)
L-Band (2 - 1 GHz)
Instrument Measurements
Measurements Overview
Ocean SalinitySea Surface salinity
Soil moistureSoil moisture at the surface
Thematic Links Global Climate Observing System Essential Climate Variables (GCOS ECVs)
ECVDescriptionProduct(s)ECV Inventory 3.0 Record(s)
Sea Surface Salinity click here click here search ECV Inventory records
Soil Moisture click here click here search ECV Inventory records
Instrument Missions
SMOS - Soil Moisture and Ocean Salinity (Earth Explorer Opportunity Mission) (2009 - 2025)