EO Sign In Authentication (Open): This collection is openly accessible but requires users to log in with an EO Sign In account (a system used across ESA Earth Observation services) before any downloads can proceed.

Access Steps:

1. Create or log in to EO Sign In account
2. Go to the Dissemination Service
3. Browse or search for the collection. 
4. Download product.

All SMOS products are freely accessible in accordance with ESA’s Earth observation data policy. An active EO Sign In account is required to download the products.

Access via FTP:

1. Open ftps://smos-diss.eo.esa.int/ via an FTP client
2. Log in with an active EO Sign In account.
3. Find the product you want.
4. Download product.

The Level 2 (L2) ECMWF SMOS Auxiliary data product, openly available to all users, contains ECMWF data on the ISEA 4-9 DGG corresponding to SMOS half-orbit. It is used by both the ocean salinity and soil moisture operational processors to store the geophysical parameters from ECMWF forecasts.

If you are a member of the SMOS Cal/Val community, you may also request access to other Level 1 and 2 "dynamic" and "static" auxiliary datasets.

Note: The detailed content of the SMOS Auxiliary Data Files (ADF) is described in the Products Specification documents available in the Resources section below.