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Aura Microwave Limb Sounder

NOTICE: The first release of Aura MLS level 1 and 2 data (version 1.5.1) is now available at the GSFC DISC. To obtain essential quality information on these data, and to initiate data access, please contact

The Microwave Limb Sounder (MLS) aboard the EOS Aura spacecraft was launched July 15, 2004.  The instrument scans the Earth's limb in the forward direction of flight, viewing microwave emissions at the 118, 190, 240 and 640 GHz, and 2.5 THz spectral regions from the stratosphere into the upper troposphere. These measurements are used to derive vertical profiles of O3, H2O, BrO, ClO, HCl, HOCl, OH, HO2, HCN, CO, HNO3, N2O, and SO2 mixing ratios, as well as relative humidty with respect to ice, cloud water/ice content, geopotential height and temperature. The vertical resolution of these data is about 3 km, and the spatial coverage is near-global (-82° to +82° latitude), with each profile spaced about 165 km along the orbit track (every 24.7 seconds).

The GES DISC archives level 0 (raw), 1 (geolocated and calibrated radiances), 2 (geolocated geophysical parameters) and 3 (gridded geophysical parameters) data products from Aura MLS.  For access to these data see the notice at the top of this page.  Descriptions of the various MLS products is listed under the Data Products menu item.

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Last updated: Feb 01, 2016 09:37 AM ET