Spaceweather Products
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Swarm Total Electron Content (TEC) - Product description and access

Swarm Total Electron Content (TEC) provides integrated electron density along the line of sight of a GPS ray received at the Swarm satellite. Swarm satellite received up to 8 GPS satellites simultaneously, therefore, multiple TEC observations at the same universal time (UTC) are possible.

Swarm TEC is provided as Level 2 (L2) data product by ESA’s Earth’s Observation program for each received GPS satellite with a 1Hz cadence. The data are provided in daily files in CDF format (Swarm L2 product format). The product names are TECxTMS_2F, with x = A, B, C for the 3 satellites respectively.

More information can be found here:
Swarm L2 product definition
and
Swarm L2 TEC product description

Swarm TEC data and metadata (XML Header file having extension .HDR: more information) are available at (ESA EO Single Sign-On registration is required: more information)
Swarm TECxTMS_2F data