Spaceweather Products
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Swarm Vector Magnetic Field (MAG) - Product description and access

Swarm satellites provide vector measurements of the magnetic field and the magnetic field intensity.

Swarm MAG is provided as Level 1b (L1b) data product with a 1Hz cadence by ESA’s Earth’s Observation program. The data are provided in daily files in CDF format (Swarm L1b product format). The product names are MAGx_LR_1B, with x = A, B, C for the 3 satellites respectively.

More information can be found here:
Swarm L1b product definition
and
Swarm L1b MAG product description

Swarm MAG 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 MAGx_LR_1B data